Terrible service and harassment.

The payment department from RCS is disastrous. I have been paying my account every month via eft but they did not allocate my payments and instead handed me over to debt collecting company called MDB. This company has been harassing me with endless phone calls and sms. I have explained to them that I pay every month but they just simply hang up the phone. They phone me while I am busy with clients and when I answer they hang up. I have send RCS 4 emails with the proof of payments requesting them to allocate the statements but the response has been shocking. I have also tried to phone them but the person on the other end was utterly clueless and could not help me. I want to settle this account and be rid of RCS for good but can not do this until I receive an accurate balance of my account from the payment department. This has been going on for 2 months!!!