I did an arbitrage trade and was silly enough to use Yobit. I bough BTG at one exchange, sent them to Yobit and wanted to sell them there.
This is why arbitrage doesn't work in practice on a consistent basis with crypto, even though theoretically it will always be profitable.
Arbitrage bots that spot the opportunities simply don't take into account the risks of holding funds on an exchange, and whether the wallet is disabled or not. This is especially problematic when it comes to high risk exchanges like Yobit, which has a track record of being extremely shady as a business.
The chat with the support worker from yobit that contacted me after I opened the support ticket is in a link below.
He said he can manually withdraw my coins with the yobicodes (2. mistake from me to send him those codes without any security. I should have stopped there and I hope this helps to prevent more damage.
He first told me to send him the BTG for the withdrawal and then he told me that I have to send him 0.1 BTC to verify myself at Yobit.. Please read the chat and you'll see that he really talked so much bullshit to get me send more coins.
If you have the same withdrawal issue please don't let yobit withdraw manually!!! They won't send you anything and always will find problems so you have to send more before you'll get your coins back..
I've heard of similar scams in the past. A guy will contact you claiming to be yobit support on chat or whatnot, asking you to send them funds in order to withdraw your stuck balance. These scammers are most likely not even affiliated with yobit, but rather just opportunistic con artists that know that a lot of people have trouble with Yobit.
That said, yobit is not a safe exchange to use in my opinion. No one knows its physical locations, who its exact founders are, and their support is terrible which opens up opportunities for scammers to take advantage. It's definitely an exchange that anyone should avoid.