Three argument chat command doesn't work?

I'm having some problems, I tried to do a tempban but there are errors with the arguments example: if i do sb/dban/mau/hello/1 it will print hello 1 but if i do sb/dban/maumaumau/hello/1 it prints

1 i tried detecting the numbers and then subtract 2 to the charpos but when i did a longer name it didn't work i tried subtracting the charpos by 1 and it gave me

h 1 and if i did sum the charpos by 3 it would print hello 1 but still if i did a longer name it gave me

1 I need help please, i've tried a lot of things but they didn't work

if string.sub(m,1,8):lower() == ("sb/dban/")  then
    local ma = string.sub(m,9)
    local charPos = string.find(ma,"/")
    local mama = string.sub(ma,charPos+1)
local charpos = string.find(mama,"/")
local amountofdays = string.sub(mama,charpos+1)
local numposition = 0
if string.sub(mama,charpos+1,charpos+1) == "1" then
    numposition = string.find(mama,"1")
    elseif string.sub(mama,charpos+1,charpos+1) == "2" then
    numposition = string.find(mama,"2")
    elseif string.sub(mama,charpos+1,charpos+1) == "3" then
    numposition = string.find(mama,"3")
    elseif string.sub(mama,charpos+1,charpos+1) == "4" then
    numposition = string.find(mama,"4")
elseif string.sub(mama,charpos+1,charpos+1) == "5" then
    numposition = string.find(mama,"5")
elseif string.sub(mama,charpos+1,charpos+1) == "6" then
    numposition = string.find(mama,"6")
    elseif string.sub(mama,charpos+1,charpos+1) == "7" then
    numposition = string.find(mama,"7")
    elseif string.sub(mama,charpos+1,charpos+1) == "8" then
    numposition = string.find(mama,"8")
    elseif string.sub(mama,charpos+1,charpos+1) == "9" then
    numposition = string.find(mama,"9")
end
       local name = string.sub(ma, 1, charPos-1)
            local reason = string.sub(ma, charPos + 1,charpos+3)

for i,v in pairs(game:GetService("Players"):GetPlayers()) do
    if v.Name:lower():find(name:lower()) or v.Name:lower() == name:lower() then
        print(reason)
        print(amountofdays)
        print("Work?")
    end
end

end