Unaccountable and not taking responsibility

I'm at the point where I'm ready to cancel my insurance and pay up for the netstar tracker.

On 8 March 2024 at 19:10 I called the tracker company to inform them that I cannot pick up my car on the tracker. They sent signals to my car and after a while they finally picked up the car.

On 9 April an incident happened where dotsure and netstar distance themselves. But I'm a dotsure client I do not pay Netstars bill. And none of the companies is taking responsibility for the incident.

On 3 May after so many calls from my side, dotsure informed me that there was no GSM interruptions and my car was not jammed. They emailed me about this.

On 20 May, I get a phonecall from netstar to inform my unit is faulty, they will come replace this on 23 May at 15:00.

After all this both companies still do not take responsibility and informs me there's nothing wrong with the unit. So why is my unit being replaced? Why is the call deleted at Netstar? Why don't anyone take responsibility?