used bad reedem code, can i remove it and use the right one ?

Hello, i used reedem code for xbox console for one game, but code was for us and i am from europe..so i want to remove this item from my item, cause i have eu code too and cant use it because i used this one, i dont care if this code will be destroyed..
i cant remove it anymore cause i used it at the start of december... or can someone please post me here support mail ? couldnt find it.. thanks for any help, have a nice day

:)