Tricks to rip us off

I had a contract with vodacom that ran till 27 November 2015. I called to terminate the contract sometime in december, not sure about the exact date. To my surprise till today i am still being billed and now my am paying for a service i am not even aware of. Today on the 5th of March i called the customer service 3 times, spoke to 3 different consultants who directed me to the cancellations department where i stood on the line for 25min, 45min and 30 min respectively with no success, where the first time the call was just cut-off. That means i will continue paying for a service am not aware of. For me this telecommunications thing of one having to cancel their contract upon its expiration is just pure chicanery for them to keep binging off our pockets, why cant the contract terminate automatically upon expiration? South African telecommunications game is just monopolic and the government is not intervening, we customers just suffer in the hands of their barbaric acts. This is the 3rd barbaric act am experiencing from vodacom. Firstly i paid for a laptop that wasnt in my posession, 2ndly 100rands airtime went missing without any trace from their side. This is fd up nxa