Poor customer service

I went into a contract with this company back in Feb 2017. In December I had to sell the vehicle that had the beame device fitted that i was contract bound, I informed the customer services that I wanted to cancel my subscription(December 2017) due to the fact I no longer had this vehicle. They informed me of a early cancellation fee that was payable, I obviously wouldn't pay that amount and they said they can arrange that we transfer the device to the new vehicle and that they will contact me and give me information on when and where this will take place. They never did and so to date December 2018 I have paid monthly as a sponsor to them. I guess this is what one can expect for a cheap device/monthly installment. They are definitely NOT highly recommended. Not sure what to do further to get this actually finally off my name...