I maked trade daily on this exchange from May until they blocked me. I just make an Order on pair coins for example BTC/USD for Bid Or Ask (lower or upper the price). If an Order was performed it means a buyer and seller agree to do that Order. I dont understand the Coinsbit team reason!
Now, I dont have access to my account but, as I know, I deposited these coins: 1ETH (3th May) and about 0.047 BTC (a some of it in 20 jul) and 16000E2C (in different dates)
Do you or have you ever used a VPN or something to log into your account? Maybe that they suspect you from trading back and forth with yourself because the same IP was being used by other traders at one point in time.
I find it quite disturbing that exchanges in general vaguely describe the 'reason' for the block, but never go into detail about what actually happened so you can prevent making the same mistake in the future. Horrible service.