First, you bumped three years old topic and OP probably forgets about this and Yobit in the meantime.
Next, nobody from here or from anywhere can't help you to solve anything on Yobit. It doesn't happen to them.
I hope you haven't much money robbed on this exchange and it's better for you to leave them and forget about Yobit. there can be nothing good for you even if you manage to log in there, still a big chance to lose your money.
Its quite relevant though since it do all connects with issue but the more appropriate to be done is to create a new one so that he would really be getting recent or new answers regarding on his issue.
@renischal issue above then the thing to be done first if on what SebastianJu said about time correction which it is most common case that you would really be having a problem if its out of sync
and if it doesnt work then there would be no viable options left but to let yobit solve itself.
I dont believe that they wont really be having those access.If other exchange can do then why they cant? This is just some bullsh*t excuse.