I found out that they are rather selective in tickets they reply.
For them 'annoying' questions can take up to a week before answered (in my case 3 weeks). If they 'like' your question or if it is easy to answer you can expect an answer within a few business days..
that's right. yobit costumer support ignoring shit tickets and question, recently my yobit account got frozed in yobit . and I submit a ticket about my frozen account , and they resolve my problem within few minutes,. so yobit customs are only active for some reasonable issues, not for blocking signature campaigns.