Mediocre customer service from Cartrack

Cartrack sent a notification on the 13th of August that the unit in my car was faulty and I’d need to contact them to arrange fitting for a new one. I contacted them on the 14th, was advised that I’d need to pay R600 to fit a new one, I wasn’t happy about that but gave them a go ahead to arrange fitting, a week later no one there was still no call from the fitment centers. I called in to follow up, a new date was arranged. I eventually got an appointment to fit a new device on the 29th August at 08:00, 2 hours later no one showed up. I called the customer service department more than twice without assistance, finally around 11:30 I spoke to a CS team lead who put me on hold for more than 20 minutes but came back and said someone was on the way to assist me. I told them that it didn’t work for me and would like to cancel my account, I was told that their cancellation department work Monday to Friday and I’d need to call in again for that. As promised I called in to request a cancellation, no one was interested in sorting out my request but they were rather interested in the finance side of this than sorting out my issue. Their account team has been harassing me for payment since then and I’ve repeatedly expressed my desire not to deal with the company since the sour encounter on the 29th August. 17th September Philani from CS calls to cancel my policy but then say my notice period will start then which I do not agree with. The company has intentionally ignored my request to conveniently suit them and want me to pay for a service that they are not offering, how do they expect a customer to pay for a device which they have picked up that it no longer works and have conveniently delayed calling to resolve the matter.