I sold few coins on vindax that worth 10$ and I don't receive any in my wallet after withdrawal, I track transaction ID on etherscan and it says 'Failed', then I head to their telegram group to complain, guess what happens next? I was told to deposit 60$ worth of Eth to an address from a PDF, I screamed scam and they block me off their telegram group, here is a screenshot
All vindax exchange team are scammers, you've been warned, stay out of this exchange at all cost
If you complain on the telegram line, just like you ask someone else to fool you. Because this is not necessarily done by the Vindax team. It might be someone else who changed the name of the telegram to the name of the admin.
I am not defending Vindax in this matter, because I have happened as you have experienced, that there are people who claim to be admin. Not only at Vindax, but many other exchanges are the same.
At Binance such a thing had happened, but after I explored it, it turned out that it was not the Binance team.