MTN please cancel my contracts. Unsatisfactory customer service and unwanted 3rd party subscriptions

I’ve been an MTN contract subscriber for 19 years and wish to cancel both contracts due to MTN’s disappointing customer service and constant 3rd party subscription being coupled to my account. Call reference: ********** 01 – MTN deducted and charged R810 for unwanted 3rd party subscriptions. I app**** for a refund but nobody responded. Call reference: ********** 37, recently the same thing is happening. I did not apply for this and MTN is unable to cancel it. Third party subscriptions need to be controlled and not allowed by MTN. I don’t have this problem with my Telkom or Vodacom accounts. Second to that, I’ve app**** for a retention to upgrade and remain a loyal subscriber, by MTN’s response its clear they not interested in the business. MTN - please get in touch with me to cancel both my contracts.