leaderstats does not add value. How can i fix it?

Taking suggestions from everybody here, I made a final fix, with explanations.

Main script:

local datastore = game:GetService("DataStoreService")
local TimeSave = datastore:GetDataStore("TimeSaveSystem")
local PurchaseCount = datastore:GetDataStore("PurchaseCountSaveSystem")

local function SaveData(Player)
    local folder = Instance.new("Folder", Player)
    folder.Name = "leaderstats"
    local Time = Instance.new("IntValue", folder)
    Time.Name = "Minutes Played"
    local PurchaseCount = Instance.new("IntValue", folder)
    PurchaseCount.Name = "Items Purchased"

    spawn(function()
        while true do
            wait(60)
            Time.Value = Time.Value + 1
        end
    end)

    local TimeError, TimeData = pcall(function()
        Time.Value = TimeSave:GetAsync(Player.UserId) or 0
    end)

    while not TimeError do
        TimeError, TimeData = pcall(function()
            Time.Value = TimeSave:GetAsync(Player.UserId) or 0
        end)
        wait(5)
    end

    local PurchaseCountError, PurchaseCountData = pcall(function()
        PurchaseCount.Value = PurchaseCount:GetAsync(Player.UserId) or 0
    end)

    while not PurchaseCountError do
        PurchaseCountError, PurchaseCountData = pcall(function()
            PurchaseCount.Value = PurchaseCount:GetAsync(Player.UserId) or 0
        end)
        wait(5)
    end

    Time.Changed:Connect(function()
        local TimeSaveError, TimeSaveData = pcall(function()
            TimeSave:SetAsync(Player.UserId, Time.Value)
        end)
        while not TimeSaveError do
            TimeSaveError, TimeSaveData = pcall(function()
                TimeSave:SetAsync(Player.UserId, Time.Value)
            end)
        end 
    end)

    PurchaseCount.Changed:Connect(function()
        local PurchaseSaveError, PurchaseSaveData = pcall(function()
            PurchaseCount:SetAsync(Player.UserId, PurchaseCount.Value)
        end)
        while not PurchaseSaveError do
            PurchaseSaveError, PurchaseSaveData = pcall(function()
                PurchaseCount:SetAsync(Player.UserId, PurchaseCount.Value)
            end)
        end 
    end)

end

game.Players.PlayerAdded:Connect(SaveData)

Major changes:

• Wrapped all datastore-related things in pcall
• Used threads to only have one playerAdded function

Minor changes:

• Changed names of items
• Capitalized all connect()s

Mannequin script:

local PantsClickDetector = script.Parent -- Put this in the ClickDetector
local PantsID = 5358411386 -- Replace with pant id

local MS = game:GetService("MarketplaceService")

local function PurchaseItem(Player)
    local PurchaseCount = Player.leaderstats.PurchaseCount
    MS:PromptPurchase(Player, PantsID.Value)
    for i in 0, 5 do
        local Success, playerOwnsAsset = pcall(MS.PlayerOwnsAsset, MS, Player, PantsID.Value)
        if playerOwnsAsset then
            PurchaseCount.Value = PurchaseCount.Value + 1
        end
        wait(5)
    end
end

PantsClickDetector.MouseClick:Connect(PurchaseItem)

Major changes:

• Actually checks whether player owns item or not

Minor changes:

• Redefined function

First off, in line 6 of the mannequin script :connect is deprecated, use :Connect instead. Test it, and if it still doesn't work, put the code that's in line 6 at the very end.

You should always pcall when using datastores, from what I've heard.