Yeah, I been mass iced before. I recently had a shell and my main account frozen for cheating in flash games :/
No, you probably don't have a chance. The only way you could probably get your account back is if you self froze it and you request to get it back.
I never got an account back except when I self froze it and requested to get it unfrozen.
You shouldn't give up hope though, I heard of some people who got their accounts back when being frozen for a reason besides self freezing your account, but that rarely happens.