Poor service

I have been a loyal rcs card user for the past ten years. Last year of they had a promotion where they offered to pay me cash on the balance of my credit limit available. They said it would operate exactly as my card had been. In December 2017 I made two full installment payments one at the beginning of the month and one at the end as to avoid the pressure of January. I then got a call from rcs in February asking for the January outstanding payment. I then tried to explain that I made two full payments i december and im upto date with my acount the consultant was extremely unhelpful and told me that that's not how it works I must pay. They then proceeded to call me continuously at a cost of R23 per call I then made a payment arrangement of which I have stuck to and despite the arrangement they still call me 3 or 4 times every month and bill me R23 per call. I am appalled by the disgusting customer service. I would not recommend rcs to anyone apart from the poor service the interest rates are absolutely phenomenal at 20.75% and compounded monthly. Be very careful before using rcs