Yobit is a scam they keep their Wallets on maintenance indefinitely and will not allow you to withdraw their old coins. I have been trying to withdraw my OMG coins without any luck for over 6 weeks now they don't respond to any of their support tickets or telegram Channel
Yobit have poor customer support also their investbox looks scammy. Many of the wallets are offline and they will never respond to any support request.
Only wallet of coin with high daily trading volume are maintained healthy there and they keep adding new shit coins without fixing older wallet's issues.