I dont know what to do i hope someone can give me some advice.
Step 1) Stop using shady exchange, especially Yobit.
Step 2) Start using your brain, and doing research before you send money to random websites (regardless of their age).
Step 3) Sue them.
Step 3a) If you don't want to waste time on that, just move on.
They already have negative ratings and several unresolved scam accusations. It is not likely that this will get resolved via the forum.