Pay back my money

I made a late payment of a cash amount of R600 for my November 2015 payment on the 17 December 2015 as they told me they cannot do a debit order before hand they are only allowed on the last day of a month but on the 21 December they double deducted my account for November 2015 as well as for December 2015 I have requested the money on the 22 December 2015 to be paid back to me and they requested a bank statement on the 28 December 2015 and I sent it to them the same day. I have sent Numerous emails and has called the call centre a number of times as well as sent emails to his email address and have not spoken to Phumelele Tshabalala as yet till today. I called again today on the 04 January 2016 and came through to a Lebegang she advised that he has closed the Case but my money has not been paid back up until now and has not received any confirmation as to what is happening on this account.