I have made some trades, deposits and withdraws at yobit and they all went well without any problem.
What I have read over time is that if problems occure their support could be better.
But what I must admit as well is that as a member of their signature campaign I did not get any payment over the last six months.
That could be seen as withholding money somebody else owns.
Why you then still keep they signature/personal text? Six months is too long time to promote someone and not to be paid...
I used to be in YoBit signature campaign few years ago, and before I left there is always problem with their wallet for signature payments - they actually added limited amounts of
BTC in that wallet and only part of the lucky ones withdraw. You should contact other members who still have YoBit signature about payments, if they have an identical problem then just stop promote them.