Yobit are scammers.
They knew my coins were going to be swapped so they put the wallet in maintenance mode and played around with the currency.
AFTER the swap, they re-opened the wallet. By that time, I lost coins because they were no longer eligible for the swap.
There is so much bad vibes out there about their operations, I wouldn't put my bitcoins over there, if they were the ONLY exchange on the planet!