Trracking terminated, while still being charged

I purchased a new vehicle and tried to get the tracker moved from the old vehicle to the new, but the Netestar phones are either not answered or the call drops. Decided to move to a new provider for the new vehicle. Gave Netstar emailed notice and even though you cannot call they want to charge 1 months' notice. Specifically told them to keep tracking active till 31 May 2026. They terminated tracking on the 14th May even though they are charging for May so my vehicle is now at risk and insurance will not cover. This is the level of service I have experienced for 7 years on the contract. I have a second vehicle covered by Netstar and when I cancelled one specific car, they removed tracking on both and only after complaining did they reinstate the 2nd vehicle. A money-making racket with no service