Cell c is *****ing from me

I am trying for months to cancel my contract with no help. I was paying R 1300, I completed the 24 months and on the 18th of feb 2019 called them to cancel, they then offered me a different contract which was only R 30. I agreed but instead of 30 they continued debiting 1300, plus all kinds of other amounts leading to over R5000 in total up to date. I've been calling them every month since and they keep assuring me that it was cancelled because after february I told them I dont want any contract with them anymore, they must just make it prepaid and stop taking money off my account. I went in store because over the phone they were not getting it done. The lady called them and i spoke to a teamleader, Brian, who assured me it was cancelled now and they will refund all the amounts since my initial cancellation. He said it would take about a week. He apologized and said that they were having a problem which I'm not allowed to be made aware of. Instead of receiving my money they took 200 again. Last saturday, 25th of may. I called them and the person I spoke to was absolutely rude. He asked me the security questions and insisted I gave the wrong answer to one and he can't help me and I should call back in 5 minutes then I said no, I've been calling every month multiple times waiting on hold for almost an hour for them to listen to recordings to see if I actually asked for the cancellation and every time its the same story. He then told me he can't help and the cancellation department is closed. So I said why didnt he tell me that from the start because he is waisting my time and airtime. He then just cut the call. Today 29th of May I went back to the store, pavilion branch, and Vanessa helped me. She had a horrible attitude from the start, I explained everything to her, she kept cutting me off telling me that I have to pay 24 months, then the lady who helped me before told her that I had finished that period, she then called the cancellation department and gave them the reference number ********** 115, then after them explaining something to her she told me they cant help me and they not giving me any refund. I then got angry and said I want to speak to someone who will help me and she said no and told me I have no reason to get angry. I left in tears because she treated me with no respect, she didnt let me speak, she didnt pay any attention from the start and didnt hear me out. She wasn't in the slightest interested in helping me, she was unfriendly and unkind. To make things worse the store was full of people, and she told me that people don't come with these matters to the store I should go call myself. I tried telling her that I've been calling and calling with no help. She left me embarrassed, and when I asked for her name she refused to tell me, but I saw it on her nametag. Cell c is blatantly *****ing my money and I do not know what to do about this anymore. Can anyone please help me get my money back from this ********* company.