Disgraceful Service

I got a tracker installed on my vehicle on the 27th January 2024, I phoned in on the 29th of January to get my logins details , when I eventually logged in on the app it was giving me a different location of my vehicle than it actually was. I logged a call with Netstar and the booked a technician to come have a look at the matter and the technician came on the 3rd of February 2024 and he was giving a incorrect time by his people and it was the time my vehicle wasn't available, he said he will call me later in the day to come back and never did , I had the phone again the Monday the 5th of February 2024 and they booked another technician to come the Wednesday 7th of February 2024 , the guy came and he attended to the issue , when he was done the device worked the whole day and it 22:39 pm it jammed again showing the same location for a whole 7 hours till 05:02 am and my vehicle wasn't there at all . I called in today to cancel the contract because now I am paying for a service that is not being rendered , what's the use of a tracker when it cannot provide you with to accurate location. Netstar want me to pay the cancellation fee but the reason for my cancellation is they failure to deliver a product that's working. My concern is that what if something were to happen in the period of the 27th January till 7th February would they had been able to locate my vehicle ? when I ask for the Manager's email they cant provide it to me and now they want to send a technician for the 3rd time .Such a disgusting service from Netstar and I haven't been even 1 month with them and the problem started the day they installed the tracker.