His thousands-of-$s account just got locked and the company isn't responding? In his shoes, with that kind of opportunity, would do the very same. But as an additional goal, I'd also aim to retire quickly, to not let the company discover my glitched character. If they do, they sue him out of everything the earned + more. I'd go with, "I got a Archmage card! How lucky!", in case anyone knows and asks about it (But I would tell anyone about my class, if nobody knows, as there is a chance, that the public is lied to by the company and archmage isn't given by chance, but actually is a pay to win class for the rich.)
Also, in case I would be caught, I would write a book and embarrass the heck out of that company for each cent I can get that way.