Wynns Warranty review: Paying too much for insurance

I bought a 2004 Ford Explorer from a dealer and was told that I could only get fiananced through Credit Acceptance and I would need an extended care plan and it would be by Wynn's. Now I need to use them and they didn't want to cover my problem that the warrent say's it would cover unless I give them the concent to breakdown the back end of my truck to find out what was wrong, what is wrong is covered under the contract and they don't want to hornor it. Both are full of ****. Mad