Charged for insurance while i called to cancell insurance and my sim card is blocked.

good morning,

May you please asssit as i had an insurance and a year back around april i called insurance to cancell and 2 months back my sim was faulty and when i called the n out of curiosity to make a sim swap and check my accounts i was then told that i have insurance ,which to my knowledge i called to cancell and it has been charging me,i am really fed up with cell c.I have been calling the insurance to enquire as i was told there is nothing they can do i have to pay and they also send me letterts from the collections department in which it ruins my credit score.I spoke to some lady by the name of Precious or Priscilla as she told me as i took my phone through thier call centre they cant do anything because i dont have documents and to add on to that i have sufferd a lot from Cell C i wont send them my Bnk statement,now i called the self service for a sim swap i was told that i need to go to the branch as my sim has not been active for 2 months i am really frustrated_1st point they owe me for all the months they have been deducting without my authority,2nd point i want my sim to be active and i want my money back.i would never recommend Cell C to anyone with the experience i have i an really frastrated and angry customer.