According to the deposits and withdrawal section they do not accept Bitcoin or any cryptocurrency, so why ask about the service in a Bitcoin forum?
It is a legitimate service and they have registration details in South Africa but their reputation and recent reviews do not seem positive so it is best to avoid the service.
I am working here, that's why if possible I would like to hear more from experts like you

Seems like VT Markets is still very unknown in the Crypto field then.