TOOK DOUBLE DEBIT AND NOT REFUNDING MONEY

I cancelled my cell phone contract with Cell C at the beginning of August and paid the termination/ cancellation fee and called to confirm that they had received this money which they had.<br> <br> Termination date was at end August. On the 1st October they then debited my bank account for the same amount as the initial cancellation fee - thus a double payment. I emailed them as I am now residing overseas and have had a couple of emails and a call two weeks ago to say that they would get back to me on the 14th October. No further calls or emails are being responded to and I need my money back.