I can imagine what response you'll get if you contact a GM.

"Tough luck; you handed out your account information. It's your fault."

They distinctly tell you not to exchange information. I highly doubt that they're going to be sympathetic at all just because of the circumstances (by the way, I'm sorry to hear about your grandmother; my grandfather recently died so I can relate a little). I'm not sure that SquareEnix cares enough about a single customer to go through the trouble make exceptions to the rules, especially when they've already told you not to do what you did.

Also, you'll never get enough people to sign your petition for it to even be noteworthy to SE. If you really feel you've got a shot at it, contact someone directly. Personally, I think you're out of luck. I suppose you know what to do (or not to do) the next time you have to leave suddenly and want to tell people.