CANCELLATION

I had a wireless router from Telkom last year August, my first issue it was; billing issue secondly it was No cnetwork coverage, my monthly premium it was suppose to be R150 monthly, but you won't believe it because since ever i had this contract I have never paid the agreed amount, in August they deducted R649.00 and there was some extra fee put when i ask they say is added services after I have spoken to this lady called Julia Vika, I immediately decided to cancel, I send them a cancellation form(2017-08-08), then someone called: Lynn Sammy called me and she promise to resolved the issues, but network issue it was only for one month then it went back to worse, 01 September 2017 they send me statement stating that they will deduct R149.00 month end, but it was not, I have even decide to cancel the contract, but i am still not winning as well, i send them an email they rep**** saying my cancellation form is incomplete, i have filled up every space, now I am not getting reply, only getting this high bill statement that i don't understand what is for. I am sick and tired of this!!!