Unfair treatment

I had 4 contracts with insurance with them and 2 contracts were due last month,while I was about to finished the 2 contracts o received an SMS thanking me for renewing the contracts I phoned and told them that I I didn't renew nd I asked to cancel several times the 2 contracts that were due last month and I even wrote an email canceling but to my surprise on the 1st of March the same package was activated to my phones and now it seem struggling to cancel because no one is helping me. I understand that the business is not good but Cell C is abusing the powers to their customers not honest and not treated them fairly. Last year August I lost my phone Cell C is failing to replace my phone. I paid the insurance the past 24 months but they keep on telling me to start the claim application now for the 3rd time nothing is happening please assist me. Thank you.