You are not scam by yobit, you are scam by someone, it's only proven a scam by yobit if that person who recruit you is connected to yobit.
May I ask what coin did you deposit to yobit because if that is crypto you can withdraw it anytime without condition.
In any case, this leaves a negative imprint on yobit. Some users still have complaints about this exchange, which suggests that not everything is as good as we would like. Although there is
https://revain.org/exchanges/yobit quite positive reviews, but the forum has negative comments from people. From personal experience, I can add that I had no problems with yobit, although I only used it a couple of times.