Without us having the proper information, how else are we to verify? Any ol Joe could say, "Hey, back in January, I donated $500 to the server. All that ad credit is now lost! Please reimburse me?" I'm pretty sure that the gms would have worked something out with you. I recall the gms working out deals with some players that had charge backs on their accounts for some reason or another.
You might have proof of it in your mom's statement, however, we have nothing that we can verify that against. AceJay was also responding to another player, and not on the topic of this thread.
In any case, I'm going to lock this, because this thread honestly, is not getting anywhere. Talis has reached his decision and it will not be changed.