Service Plan

I took out a policy with motorvaps what a nightmare this is. I claim for my cambelt and they refused to pay after proving them wrong they had to pay but also never the full bill. I then decided to sell my vehicle, when i wanted to cancel the service plan there is now cancellation fees, my gosh they just know how to rip people off. The manager says that I will be liable for the payment, so whether or not I like it I dont have a choice.