@haim85 Aww man. I'm sorry. What'd you do? Anyway, there's two things that could be happening here.
1. Ip/Account Banned:
Okay, if you can sign in to another account and you don't get this error, then you most likely just got your account banned. If you sign in to several accounts and you keep getting this error, then you mostly got IP BANNED .
As said above, the only way around it is to get an IP changer. Try HideMyIp, that one should work. You can find a full version of a IP hider on here somewhere, just gotta look.
2. HWID Banned:
THIS IS PROBABLY THE WORST THING THAT COULD EVER HAPPEN TO ANY GAMER IN THE WORLD. If you get HWID banned, that means that they completely banned your computer. Meaning no matter what you do, you can't play. No IP Hider, No Different Accounts, No nothing. You can always try a different computer but I think HWID ban also bans your IP too so there is no possible way around it except use an IP hider on another computer.
I'm terribly sorry you got banned...I don't know how this could have happened considering we don't even have a hack on mpgh...