AMP Extended Warranty didn't avoid worry

I have been driving my Cheverolet Spark 2013 model for about two years now. I took an extended warranty to be responsible and have peace of mind. My car then started losing power. The first culprit was the spark plugs. One burnt out so I had all replaced. But it didn't solve the problem. It turned out to be cylinder 4's fuel injector. So now I needed to put in my very first claim.

The claim was put through as two hours of labour on fitting the fuel injector where it was supposed to be 1 our on the fitting and 1 hour for running the REQUIRED diagnostics. The result was that the full amount was not approved. This is a bad experience for someone who has never missed a car payment and never made use of the policy before. I feel ****** and mislead.