Deduction after settlement

I am a huge Cotton On fan. I love their clothing, therefore I decided to open an account last year. However, I have now decided to close the account as I am trying to take more control over my finances. I then went in to the Tygervalley Cotton on branch. The manager then assisted me in obtaining an easy pay number so that I can settle the account. On the 27th April 2016 I settled the account at Pick n Pay. I was then going to close the account however, on the 28th April 2016 a debit order still went off. I then called in on the 29th April to inform them of the error and I was told to go into the bank to reverse the payment. I told the consultant I will not go into the bank as it is the end of the month and would require me to stand in a long line. As it is not my error I expect the money to be paid back to me. The call centre consultant then confirmed my bank account details and told me that I would be contacted within 24 hours regarding repayment. I have still not received any communication regarding the repayment and I have tried to call in again, however I have been waiting on the line for more than 15mins with no answer. I would like my money back please, I have been a loyal customer and have never given any payment issues. I expect better customer service than what I have now experienced.