BlockTrades is not a wallet, more like a currency exchange at an airport than a bank.
What have you been entering for your "Receive Address" when creating BTS transactions? If it has been "blocktrades" then we'll need to track down any resolved transactions to get them transferred into your own wallet. You will need to have your own personal BTS wallet to manage your funds.
I think we've spoken by email before, so I will check any transactions I can find that are associated with your email address. If you could email me again with your BTS wallet name and the names/addresses of your source wallets (the ones you have used to send money to us) I can try to locate all of the BTS transactions that have been deposited to "blocktrades" and manually transfer that to your new BTS wallet.