Permanent ban

Hello. I was playing LoL for about 4 years. I had a break for about half year ago and now i tried to login again and saw that i got permanently banned. I wrote to the support, and that wasn't helpful at all. They said that i used some kind of 3rd party program that is not allowed. I did not, and i could login just fine 6 months ago. They even said that i am responsible even if someone just hacked my account and thats why i got banned. Does anyone encountered with something like this? Can i do anything to get my acc back?
Report as:
Offensive Spam Harassment Incorrect Board