Poor cancelation response and threats to the customer

I canceled my contract for car tracker on 14 April 2023 since I had sold the car and was leaving South Africa. This was the day before 15 April debit order went through of which it was successfully paid.

On all occasions when I sent cancellation request, I was told that the retentions department will call me but noone ever called or send cancellation confirmation, I am only receiving smses now since there was no payment.

On 15 May I received debit order which I reversed since I had canceled the car tracker contract.

This is upsetting because I have sent emails, called Netstar on 12 April 2023 and 17 April 2023 even send WhatsApp to cancel the contract stating the reasons.

Today I received threatening sms to list me under credit bureau, even though I have canceled contract, what dismays me the most is that I am no longer in South Africa and I don't even own a car but I am expected to pay for service that was not rendered to me.

Even if I come back to south africa NETSTAR is a no go car tracker company for me.

What's disappointing the most is that I was their loyal customer since 2019, paying monthly with no complaints or claims.

In 2023 they are refusing to cancel contract.