It happened to me and it was a pain in the a** getting it back. Had to go through AAdvantage customer service (EXP desk doesn't correct those mistakes...they just initiate them ). After I finally got it credited, it promptly disappeared because it had "expired". When I finally made it clear that I didn't know "Mr John Q. Thief" who had used it and thus shouldn't be penalized for it's expiration since I didn't have it in my account to use, they finally credited it back to my account. It appeared as a "customer service " evip with an expiration date one year later than the one improperly debited. A royal pain in the a**, but finally got it back with a year's use added. Btw, John Q Thief's AAdvantage number was nothing like mine, so it wasn't a fat finger mistake.