HELP WITH PREPAID CODES

guys plssss help me I made a account,i used a prepaid code of turkish region as my region was set to turkish but today my favourite vandal was in the store so i bought the code from a website where i bought it previously since i don't have a bank account but the game isn't letting me use it, pls help ASAP otherwise my vandal will be gone from the shop(in 4 hour)