They stole my 2.1BTC and I could do nothing.
you must create thread in this section, follow the appropriate format:
https://bitcointalk.org/index.php?topic=260073.0post all proof that you have and create flag
PS: I see that their support has improved a lot compared to the past years, they have been active on twitter, on yobit chat and on their telegram channel so if you have proof and post here, I believe that with pressure of the community you may be able to recover your bitcoin if you are right and they are wrong