Contract cancellation

I'm so frustrated with Telkom. My contract ended in September, decided to upgrade I October the 14th, they promised to deliver the phone, but the phone was not delivered up until today. I have been contacting them almost 3 times a week for delivery and I decided to cancel the contract because they failed to deliver. I have been calling almost every day to check how far with the cancellation and its 2 months now, they did not cancel the contact. I'm billed for something that I don't have. They blocked the sim card as well. I have been calling, and they are telling me that they are escalating the matter but no feedback. I'm sure now all Telkom agents know me by name, I have never seen such a bad service, I took the initiative to visit the Telkom store, but they were unable to help. What am I supposed to do now, why am I being billed for something that you guys failed to deliver. I'm spending my money to call you every day for the progress, but not even once had I received a call from you to update me. For the whole 2 months of bu.....it from you guys. You must be ashamed of yourselves and what you stand for.