Acc blocked

Hello. I play with my friend on one account or rather I played. Today, in the morning after yesterday's work, I wanted to go to the shooting, and then I look at my account and get a permanent block. Not praising it was colonel 6. And here the question arises whether there is a chance to recover this account? He was there to buy VIP by me, and I never got a ban on this account, and I have been playing with a friend recently and I'm sure he used something. I am asking for advice? How to write a request or rather appeal against account blocking.