CELL C the bad service provider

Had had a 24 month cell c contract that ended on the 27 August 2020 which cost R289 for 50GB per month. I assumed that it would continue on a month to month basis at the same monthly premium as other network providers do but sadly on the 07 September 2020 Cell C debited me for R705. I called on the 8 September to query only for Cell C to inform me that sorry this is the normal price of the contract which I immediately requested to cancel. As per the policy 30 day notice for cancellation which was fine only to get billed another R705 on the 7 October 2020. Then comes the 9 October 2020 Cell C terminated my contract but instead of migrating my pro rata data to a pay as you go, they took it away. I complained but the response is "once your contract is cancelled all benefits falls away" This is totally unfair as they charged me R705 for 50GB and two days later took whatever the balance was away. Does the CPA not have any recourse on this bad devious practises?