Credit Record ruined

Hi guys am really annoyed with the way TelkomMobile is treating me all I get is problems after problems, I had a contract with you which I sent in forms to be cancelled on the 14th of December 2017 but to my surprise am still getting billed and no communication was sent to me no one called to ask me about the default, I have been calling the call centre since Friday no one has got back to me and now my credit record is bad because of this each time I call ur call centre I speak to a different agent and they have to restart the process I hold for over an hour and they cut the call without even telling me, also spoke to one of the managers Charmaine Masoko who said I should report this matter as there was nothing she could do for the 2years I had a contract with you guys I dd not default even one installment but now this is the thanking you give ur loyal clients, am kindly asking you to contact me about my contract because I need this issue sorted so we can part for good. The line in question is ********** it an iPad you can contact me on this number **********