Why is DataStore not saving the Stats and Tool BoolValues?

Hello again!
I will try to make this question as clear as possible!
Firstly we want to set up our Remote Event. To do this, insert a Folder into Replicated Storage. Name this Folder "Events". Inside of our folder we want to insert a Remote Event. Name this Remote Event "ToolPurchase".
Next, in Server Script Service, we want to insert a Script. Name this script "Event Handler". Inside of our script we want to define a few variables:

--//Get Services
local ReplicatedStorage = game:GetService("ReplicatedStorage")
--//EventFolder
local Events = ReplicatedStorage:WaitForChild("Events")
--//Events
local ToolPurchase = Events:WaitForChild("Events")

Then we want to create a listener function:

ToolPurchase.OnServerEvent:Connect(function(Player, Tool, Value, Amount)  --When we fire the server (ToolPurchase:FireServer()), three arguments will be passed: The tool name, the value to change and the amount to take away. E.g : ToolPurchase:FireServer("M9", HasM9, amount), the server will do the rest for you, so DO NOT change any of the following code.
	
end)

Then we need to add the tool purchase process

ToolPurchase.OnServerEvent:Connect(function(Player, Tool, Value, Amount)
	local Clone = ReplicatedStorage:FindFirstChild(Tool):Clone() --Find the tool and Clone it
	if not(Player:WaitForChild("Backpack"):FindFirstChild(Tool)) then --If they do not have the tool
		Clone.Parent = Player:WaitForChild("Backpack") --Clone it to the PLAYERS BACKPACK (NOTE: Players do not have a "StarterPack", and StarterPack intended
		--Use is to clone the tools inside to EVERY player when they die/join. So you must use Player.Backpack)
		Player.leaderstats.Points.Value = Player.leaderstats.Points.Value  - Amount --Subtract money from the player
		Value = true --Set the value to true
	else
		print(Player .. " Already Owns: " .. Tool) --If they already have the tool
	end
end)

The whole script should be:

--//Get Services
local ReplicatedStorage = game:GetService("ReplicatedStorage")
--//EventFolder
local Events = ReplicatedStorage:WaitForChild("Events")
--//Events
local ToolPurchase = Events:WaitForChild("Events")

ToolPurchase.OnServerEvent:Connect(function(Player, Tool, Value, Amount)
	local Clone = ReplicatedStorage:FindFirstChild(Tool):Clone()
	if not(Player:WaitForChild("Backpack"):FindFirstChild(Tool)) then
		Clone.Parent = Player:WaitForChild("Backpack")
		Player.leaderstats.Points.Value = Player.leaderstats.Points.Value  - Amount
		Value = true
	else
		print(Player .. " Already Owns: " .. Tool)
	end
end)

Note: You should not change any of the above code.
Next, assuming your "Shop purchase Script" is a local script and inside of a gui, We can do the following code (Note: It is much more efficient to have one local script, that control lots of GUIs, than lots of local script that only control one GUI.)
In our script:

--//Get Services
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local Players = game:GetService("Players")
local Player = Players.LocalPlayer
--//EventFolder
local Events = ReplicatedStorage:WaitForChild("Events")
--//Events
local ToolPurchase = Events:WaitForChild("Events")
--//Guis
local ScreenGui = script.Parent
local m9button = ScreenGui:WaitForChild("m9button") --change this to wherever the button is located
m9button.MouseButton1Click:Connect(function()
	local amount = 100
	if Player.leaderstats.Points.Value >= amount then
		ToolPurchase:FireServer("M9", Player.Backpack.Inventory.HasM9.Value, amount)
	end
end)

Then inside of our ToolGiverCheck(Remove previous code):

local player = game:GetService("Players").LocalPlayer
local rs = game:GetService("ReplicatedStorage")

player.CharacterAdded:Connect(function(character) --When the character is loaded
	if player.Backpack.Inventory.HasM9.Value == true then
      	  local m9 = rs.M9:Clone()
      	  m9.Parent = player.Backpack
    end
    if player.Backpack.Inventory.HasPistol.Value == true then
        local pistol = rs.Pistol:Clone()
        pistol.Parent = player.Backpack
    end
    if player.Backpack.Inventory.HasM4.Value == true then
        local m4 = rs.M4:Clone()
        m4.Parent = player.Backpack
    end
    if player.Backpack.Inventory.HasShotgun.Value == true then
        local shotgun = rs.Shotgun:Clone()
        shotgun.Parent = player.Backpack
    end
    if player.Backpack.Inventory.HasSuperball.Value == true then
        local superball = rs.Superball:Clone()
        superball.Parent = player.Backpack
    end
    if player.Backpack.Inventory.HasRocketLauncher.Value == true then
        local rocketlauncher = rs.RocketLauncher:Clone()
        rocketlauncher.Parent = player.Backpack
    end
    if player.Backpack.Inventory.HasGoldenGun.Value == true then
        local goldengun = rs.GoldenGun:Clone()
        goldengun.Parent = player.Backpack
    end
    if player.Backpack.Inventory.HasBombthrower.Value == true then
        local bombthrower = rs.BombThrower:Clone()
        bombthrower.Parent = player.Backpack
    end
    if player.Backpack.Inventory.HasAK.Value == true then
        local ak = rs.AK:Clone()
        ak.Parent = player.Backpack
    end
    if player.Backpack.Inventory.HasFireball.Value == true then
        local fireball = rs.Fireball:Clone()
        fireball.Parent = player.Backpack
    end
end)

And thats it for the tool purchase! You do not need to change any of the code (apart from paths to objects, e.g game.Workspace.Part).
For the DataStore I am going to focus on the player added function. Which goes like this:

https://pastebin.com/KaGvy1Y8

Im not going to write the whole thing, but I will show you how it should be wrote (again, but working).

https://pastebin.com/pymZ49MU

You'll notice I have only done it for the first three. Do this for the rest of them, but make sure that When setting the value (e.g: val = false), make sure it is the right kind of value. e.g boolvalues must use false and true. int values must use numbers
EDITS:
https://pastebin.com/PDRrRrsR --Global death script
When I was looking at your place, you did what I said not to which was to create multiple local scripts and not jsut one. its okay to have 1 or 2 but not like 17!! xd
Also, the reason its not saving is because the values are not actually being changed on purchase.
https://pastebin.com/YPiic4aq --here's what the purchase should actually look like
also the event handler:
https://pastebin.com/zrNteZxS
also your heal pad script I fixed:
https://pastebin.com/AiX7LzCA
I also noticed that when you die I get the error "roblox needs to quit! we're sorry!" error, so make sure to save and publish before you test!
--every time I try to fix it roblox studio crashes