but, anyway i willnot be surprise if it will be true, because yobit has one of the worst support i have ever met
What's the connection of the lost coin and the worst support of yobit?
lmao this is so funny, would a huge exchange such as yobit really scam someone for fuckin like $30 instead of all the other big whales on their exchange? f
Don't talk that you really knows what had happen. Even big companies related to bitcoin happen like this scenario e.g. in any exchanging sites.
when did you last send support to yobit? sometimes yobit reply within 48 hours, check your emails, hope this can help.
As much as I know it took a week or a month/s before yobit support reply, I don't think this 2017 if they change and make it as there new years resolution. But just try to contact them its the only your choice to fix this issue.
Anyway to OP as what others saying above you can't just make an accusation to someone without proofs, give us some proofs like you last transaction to yobit, the TXID, screenshots of your current balance, or even withdrawals.