Still being billed for services never given

Hi<br> <br> Telkom attempted installing an ADSL and home phone service in June. Unfortunately, my home did not have a Telkom connection from the main Telkom box in my complex to the house. The service was never installed.<br> <br> I received statements for a few months and then battled to finally get the credits passed for this (as I obviously should not pay for a service that I did not receive). I thought the matter was resolved as the credits were passed, but I notice Telkom is still billing me for this.<br> <br> I can't understand why the service is so pathetic - It's November and I've told them several times that this service was never installed - they credited me, and now they are billing me again. Extremely frustrating. I need this account closed ASAP.