Obviously you're the one who's in the wrong.
They can't unban you cause of what you did was majorly incorrect.
Entering someone's account because of the word 'giving away!' just wants players to get you ban/jailed. The rules cleary stated "any use of selling or giving away accounts will not be tolerated".
And it's just 10 hours, it won't kill you to not play for a few couple of hours.

Bad news for you is: learn your rules.