incompetence service provided

I got paid last week Monday and immediatelyafter i withdrew a certain amount decides to freeze my account due to source of the said amount. I have given them all supporting documents as proof, but so far no one from the bank has contacted me or indicated a way forward.i am very disappointed with their service as their client.my life and plans have to be on hold due to their incompetence. what should one do to be taken serious, disappointed.