found withdrawal transaction just after my deposit on yobit in blockchain explorer
9th Feb 2018 16:00:14 810a4cabdaa34b462fd891a9a0db42c0bcaf5997c4646a85468b49853ba725b7 - 17593884.41614571
9th Feb 2018 14:45:11 6b791ccbf80c25287e9932e98c079fbe6ec33c905cb82a6ec410527701a9b756 + 17593884.41614571
check on which address it was being sent mine were
5rXR3YepkcVyqxz36Lh6jDMp3CiHGRB14i
6DKn3X5VLBYdGWnFBBqGDqnU7Ak5oPbGYU
don't know to whom they belong. Yobit?
Please refer to this tread:
https://bitcointalk.org/index.php?topic=1475699.msg29997340#msg29997340how does it solve my issue

?
When you have an issue with an exchange community members can't just go into the exchange and fix it. Your issue is with the exchange and you will need the exchange to do whatever is needed to take care of the problem.
I wonder....
Has the yobit hotwallet gone into a negative state and they are forwarding coins to other wallets. Could explain some balance problems and withdraw problems in 1 fell swoop? Could that be what is causing their problem(s)? With the new wallet software enroute, is it possible to effectively nullify (or blacklist) the yobit wallet to stop more people loosing funds? Is that even an option that should be considered?
I am just kicking the ball about here... Not demanding.
If yobit continues to fail to do anything, something will have to be done to force their hand and it would be a good idea to have a plan ready rather than start thinking at THAT point.