That VaultMex looks very dodgy, no trading fees forever has the alarm bells ringing... forever. I bet it's a scam, i mean how the hell do they even make money from that exchange then lol
You are right man, it looks like a scam. I am waiting for month now to get my coins back. you are able to deposite ut you never gonna be able to withdrawl! They keep on deleting every post regarding this problem. They block ppl on twitter on ban them on discord just for asking to get their funds back. Have a look at their old btc forum!
I would recommend not to use this exchange!
https://bitcointalk.org/index.php?topic=4987019.0