It's good when the law and the police are on your side. In our country there is no such thing.
I doubt legal action would work because yobit's terms and conditions cover it from any user mistakes. A long wait for a reply to a support ticket is the OPs best hope.
https://yobit.net/en/rules/Visiting the Website means that the User accepts the given Agreement and all the terms and conditions stated below. The User is obliged to fulfill all the local legal responsibilities in the country he is resident of and to take complete responsibility in case of their violation. User undertakes complete responsibility for taking decisions on trade transaction fulfillment. The Stock Exchange is not liable for possible losses caused by User's ineffective funds management.