I was trying to buy RDD I had my order in and pending, but it wasn't going through. I opened a ticket asking what to do and was told I needed to cancel my order. During that time the price went up nearly 20%. I was trying to figure out what to do and was told "What do you want us to do?" when asking about how this could be resolved other than cancelling the order.
I also bought DIME, but I can't sell it and can't transfer it. The price has gone up 9x. Why would they let you buy a coin they don't support the wallet for anymore?
I've traded on yobit before, i found that their exchange is clunky, slow, weird, and very shady. No one knows who the operators are, if the exchange is being used for money laundering etcetera. It is better to stay away as it is filled up with shitcoins which are being pumped by yobit themselves probably, or some other shady trader.
I have received withdraws from them, so i wouldn't call them scammers, but there is definitely some weird shit going on on their exchange. I'd say that bittrex & Polo are way more reliable.