Poor Customer Service

I bought my furniture at Coricraft on the 10th December 2015. The very same day I made a payment of R3000 via speed point at the shop as my December payment. I asked the sales lady when will my next instalment be and I was told that it will be in January. To my surprised a debit order of R2511 was supposed to go through from rcs luckily my account did not have any money or I would have paid R5211 for my furniture that is hardly less than a month. Now my account is in arrears, but I made the payment. I called today and spoke to Lusanda, he really has an attitude, clearly shows he does not even know his work. I asked to speak to the manager and I was told that she will investigate my matter further without even talking to me. I don't know if this is the kind of service that RCS offers, but there is a lot of incompetency from the staff I have spoken too. I was told to email my proof of payment so that I can get a refund. I did that and nothing happened.