The worst thing can happen to a AdSense publisher is receiving the mail by Google telling your account is disabled. Its pretty hard find a good ad network like AdSense to earn money online. None of other PPC networks pay like AdSense. Its next to impossible to get the account back since they are not very cooperative about this matter. Specially if you are banned for invalid clicks they wouldn't even bother to give you a another chance.

But still if you haven't done anything then contact them and providing them proof that you haven't done anything might let you get your account back. Not often you heard about someone getting the account back but since you have nothing to loose its worth trying. If you AdSense account is banned then write them a polite mail providing them stat logs and everything you can to prove you haven't done anything wrong

This is where Google analytic account can come handy. You can ask them to check your analytic and find if anything wrong there. You might need to mail them several time to get a response. Always be polite in your mails. If none work then you ll need to find Alternative ad networks to earn money online. None of other ad networks would pay you like AdSense but still you can get more traffic and try to earn money from these sites too.