I read some good preview about them
Not familiar with this exchange. Can you give the link to that review about them?
They said the transaction take few minutes. ..but now after hours nothing happened. ..and they don't respond the email from hours
Any experience with them?
If there's a delay, maybe they have manual processing for some special withdrawals. I don't know how it goes but that's likely to be it. Continue following up your withdrawal to them within their different social media accounts and it's at the bottom of their welcome page. Seems like this is a Russian exchange because as I know vk.com is only for Russians.