I just purchased the titan quest for £2.50 had my credit card ready and it said " Payment accepted " will now add this game to your steam account. Thing is i hadn't entered anything and on checking it took the money out of my old credit card account which i was due to close next week!. Now because steam has taken money out from it , i'll have to wait another month till it's closed 
I didn't know it kept my credit card details on steam for future purchases , how do i contact steam to take it from my other card and not the one i don't want it to

I didn't know it kept my credit card details on steam for future purchases , how do i contact steam to take it from my other card and not the one i don't want it to
