Money missing from my account

On 5 August 2015 I received money from a policy to my account. In september I tried making a withdrawel and my account was closed. My money is now no longer in my account. I queried at the bank, after which they said my account is closed. And no trail of where the money is gone to. I called my policy holder and they did not get any money back from standard bank either. Its been now almost 3weeks, I am coming to the bank and no one can get in contact with head office to claim my money back.