MTN Contract Cancellation issue - Unwanted charges and lack of confirmation

I had a cellphone contract with MTN from 27 March 2023 to 27 March 2026. I requested cancellation via customer care email on 16 February 2026 and they advised me to resend the cancellation request on 26 February 2026 since the contract ends on 26 March 2026, they provided me with reference number 2e9dad3c-ec6d-4aec-a55f-a427cd1d8829. Despite this, MTN: • Credited me with a 6GB data on 27 March 2026. • Continues to contact me and my wife about upgrading • Hasn't sent cancellation confirmation • On the 1st of April 2026 they have debited R807.99 from my bank account although I was paying R627.11 during my 2 years contract

I want MTN to: 1. Stop unwanted contact 2. Confirm contract cancellation effective 26 February 2026 3. Address incorrect data allocation 4. Refund my debited money

Frustrated with the lack of clarity and persistent contact.