Unprofessional service

On the 22 December 2015 my uncapped adsl line was installed at my residential address. I was so happy with this product because it also came with wi-fi. On the 08 of January 2016 I received my Telkom Bill and to my dismay I see that Telkom started billing me from November, 1 month before the line was installed. I contacted Telkom and they lodged a dispute and said they will contact me within 30 days. It's now 2 months that no one has contacted me, I also sent through a cancellation form requesting my line to be cancelled immediately, however one call centre agent had told me that Telkom will get back to me in 30 days time. Being a big company Telkom is so unprofessional.