Poor Service

I opened my account with Cartrack in September 2023. My asset was ****** in December 2023. they failed to recover my asset. mid 2024 my asset was recovered in Eastern Cape, I live in Gauteng. Though it was not recovered by Cartrack. I had to pay courier fees to get it from Eastern cape to Gauteng. trough all this I been paying for my cartrack account. When I got my asset back I realised it did not have a tracking device no longer as it was removed when my asset was ****** so I called Cartrack and requested they cancel my account because they were no longer providing the service I was paying for. Its 2025 now and they keep spam calling me telling owe them money in unpaid fees. They then offered me a discount to settle the account and finally close it off. They sent me an offer via email from their law firm. before I made payment, I asked that they confirm the account would be settled and closed. They indeed confirmed. I made payment and sent the proof of payment. After that they never rep**** my emails. I sent them countless reminders for them to send me proof that they closed my account, but still nothing. now they are calling me again telling me I owe them. How can I escalate this matter. firstly I lost money on the asset as I was using it for business, I further paid Cartrack even after it was ******. I then paid courier fees from Eastern Cape to Gauteng. Then I paid to settle me account.