Tracker's below average service

I have been with Tracker for almost 4 years today. I am seriously frustrated with their service. My main issue with them started one time when i received a call from one of their consultant who sold me a Tracker Guard to which I indicated that i was not interested.

Notwithstanding this, Tracker started debiting money which included the Guard which i indicated that i was not interested. Subsequent to this, reversed some debit orders as they were debiting more than we agreed on. I also changed method of payment with them from debit to paying cash.

I pay my account with them on month-end, however, often than not, I receive messages from them demanding money in the middle of the month even after I have paid. I tried to inquire with them previously but i have not received any feedback.

Today on 12 May 2020, i received an SMS demanding a payment of R142.73. This happens after I paid my premium of R 150.90 on 30 April 2020.

I am seriously frustrated with them and I need a way to lodge a formal complaint against them and if possible terminate my arrangement with them because they offer a below average service