Overcharging for expired contract

I am overcharged for an expired contract. I used to pay R766 for two tablets + 10 gig internet each. Reception where i stay is bad and complained about this many times. No action taken from telkom. So in october my contracts were finaly ending and numerous times I had indicated that i wanted to cancel these contracts. So in October i was charged R206 as it only had a few days for that month. So i get a bill of over R1500... called the customer service centre and i was told that i personally had renewed both contracts on the 10th of that month...really i did and would never do that. There is also no record of me doing it so i was told to cancel my contract... but it expired... ok so cancelled it at the of the month and than another bill of R730. Called the call center again and a not so willing to help woman and she told me that that is telkoms rules. I was not informed but she cared less as she workes for an inbound call centre not outbound. I didnt care, telkom is telkom, inbound outbound, i dont care. She unfortunately did not care. I asked about another case that i had regarding a CLI that i paid for, but again there was no record of that eighter. Sad telko