What makes you ask the question in the first place if Bitmart is a scam have you deal with them and did not get your fair share or they break the terms of operations, you need to give us something to work with. Because some of us here have not use the exchange before and at that can not give our feedback.
yes i am ashamed to say i transferd some BSV coin to the account then got nothing credited to me
the wallet on their site says in maintenance no Deposit or Withdrawal just trade, a day after the deposite
tryed to contact customer support and got a replay to the support ticket twice that they are aware of the issue and trying to fix it and the second that they are looking closely to my specific issue