Waiting for over 3 months for my refund

On the 3 March 2015, I contacted the SABC TV licence call centre to request a refund of R820.00 and was told it would take 4-8 weeks and when I called to follow up I was informed it was deposited on the 18th of March but it was deposited into the closed Nedbank account, so it should have come back to them but no one is willing to check on this I get rude call centre agents who just scream at me and tell me to go to the bank and quickly hang up the phone and are not willing to hear what I have to say. I asked for a supervisor but was ignored and phone dropped in my ear in a very rude manner. It has been over 3 months and I'm still waiting for my refund.