AA Mechanical warranty . No Service

I have got a mechanical warranties with AA for 2 years now .The 1st time i claimed for a faulty oil cooler ,they did not even pay half of my claim .Now the second claim is for a faulty vanos which is part of the camshaft . And my head is warped ,the car did not overheat. They are refusing to pay 1c of the whole claim . And they dispute the Vanos is part of the camshaft . When i decided to go with AA i was warned against them now i am sorry i did not listen. This is not piece of mind .