Harassment for a paid up account

On the 12th August I was contacted by Nombuso Ndlovu from the accounts department regarding the arrears on my account. I had requested from her that she make arrangements so that I can pay my account in advance for August to December. Meaning my next debit will be in Jan 2026. The morning of the 13th August I made a payment of R2444 which was made up of arrears (1057.58) and AugtoDec premium (1385.45). Since then I have been harassed everyday via email sms and calls and my account is being debited continuously. Everytime I call in or someone from accounts calls me they acknowledge that they see the payment but they are not allocating it. Now I’ve recieved an sms that my app is going to be blocked for an amount which I have paid. I’ve requested for feedback from the accounts department last week and still no feedback. I want to cancel my account with Cartrack and I want a refund I can rather join another company that I’ve used before and has never given me such issues