Telkom Charging for no service!!!

I have 2 lines with Telkom which was used strictly for adsl for a long period on a month to month agreement which you can cancel at anytime as well as services are suspended when not paid. In October 2015 i cancelled the lines and switched to Telkom LTE which worked better. I emailed a cancellation letter and thereafter my lines were cut therefore assumed it was cancelled correctly. After such i was still billed monthly for services not provided and now my bill is sitting at +- R4000 for NOTHING. Telkom can surely see there is no usage as they also cut the lines plus i did send my cancellation letter. i would understand if this was not a month to month contract. Further more from inception Telkom was over billing me for a 10mb line when i was only given a 2mb or 4mb lines as i was told there was no 10mb coverage in the area.<br> <br> I visited the Chatsworth branch and a kind lady assisted me with this dispute as she submitted to head office. I urge Telkom to please sort this out asap as i will be travelling in 2 weeks and would not want this to affect any boarding or check ins at airports or destinations.<br> <br> I trust they will see they are incorrect and rectify and not cause me to not travel