Netstar/Dotsure Car Insurance money making swindle

You are forced to take out a 3 year contract with Netstar to get Dotsure car insurance. Should you change cars you have to pay for Netstar to put the tracker in your new car. Should your car be written off in an accident you are still liable for a 3 year contract with Netstar even though you can no longer use the tracker. Should you terminate your dotsure policy you are still liable for a 3 year contract with Netstar. Which is exactly why, when the Netstar division of Dotsure contacted me after 4 years to tell me the tracker was no longer working and I need to put in a new tracker and take out a new 3 year contract with Netstar I refused. In writing by email, and telephonically, I said I will not accept another 3 year contract with Netstar and I want to cancel my policy. I was not advised that I need to cancel the Netstar contract separately with Netstar. So while Dotsure is happy to do the contract and everything on Netstar's behalf when taking your money is involved, they say it's not up to Dotsure to cancel the Netstar contract when you cancel your policy, you have to do that separately only now that I have queried with them why the Netstar hasn't been cancelled along with my policy cancellation and request to cancel everything. So I am now being billed by Netstar for a contract I have not signed and taken out with them and have received what they call my "First Invoice" for a tracking device that is not working and Dotsure is denying liability for not informing Netstar. So the Netstar division of Dotsure only works for you signing up for a contract and not for cancelling a contract. That is BS at it's finest and a money making swindle so they can continue taking money from you.