MTN will not accept sale cancellations within 10 day cooling off period

On 19 October 2021 An unsolicited MTN agent phoned and persuaded me to migrate my contract to a Mega N package for the same cost. On 20 October 2021 i instructed MTN, in terms of their 10 day cooling off period, to cancel this sale and revert my contract back to the Made for Me S package for a lower cost. Despite many e-mails and telephone calls, MTN refuses to implement my cancellation instruction, thus breaking the term of the Consumer Protection Act. MTN have admitted that they have received my instruction but everyone just passes on the buck, blaming other divisions of MTN.