[quote name='IAmTheCheapestGamer']But, like Scorch said, why not just contact Gamestop directly and deal with them? After all, they would be the ones to know for certain if you could cancel and get another $10 code to make up for the one used.
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Maybe someone on here already dealt with this before so could let him know. Any question anyone asks on these boards can be answered more accurately elsewhere, this is obviously just the easiest first step to take. If someone doesnt know or knows of a better way to find out then great, no harm in asking. And like he said, no need to be a douche about it.