Uncapped Data Service - Telkom

I app**** to upgrade my Smart Broadband Wireless services to uncapped and was informed that the application could not be processed telephonically, but I would need to go to a Telkom Shop for this to be processed. I live in Bathurst, Eastern Cape and the nearest Telkom shop is over 150km away. In light of them informing me that this could not be done, I requested the cancellation of the service. The following day, I made application for a new uncapped service. Within the week, a Telkom Sales Agent called and confirmed that I could upgrade the existing service to uncapped and we telephonically finalized this matter. I specifically mentioned to her that I had app**** for a new service and that it would not be required any longer due to the processing of the upgrade. To my dismay, I received my Telkom invoice and they have billed me for two uncapped services. On several occasions and at different times of the day, I have attempted to get in touch with Telkom to get this matter resolved, to no avail. The numbers go unattended and I have waited for someone to answer the call for up to an hour at a time. I am at my wits end and do not know how to resolve this issue. The lack of service is abominable.