CELL C Worse Nightmare

I took out a contract with cell c in 2015 September which was 24 month contract for cell phone number ********** 923 and also ********** 748, this was worse nightmare that I had with cell c, because at the end of my contract I called in August 2017 requesting for contract to end September this wasn't done many calls received introducing new products to me which I refused to take and only advised these agents to cancel the contract, to-date this hasn't been done I am having to go to bank every month to reverse charges on a contract I've done paid up till September 2017 and even made payment in October, I have escalated this to many people at Cell c that was absolutely useless, this company might just close their doors as this is a very bad experience and would rate their services pathetically low for what I've been through they promised to call me so many times and still I haven't received this call to resolve this issue Led to a bad credit record and I am very frustrated and irate and would like to speak to cell c senior managers as all these amounts should be waived as I paid for 24 months on these contracts.