I know nothing about extended warranties other than the fact that they are usually a poor investment.
Not having your contract in front of us, how can we advise?
Read the contract, there must be a procedure for challenging a denial of coverage.
Build a life you don't need a vacation from.
2016 Silverado 3500HD DRW D/A 4x4
2018 Keystone Cougar 26RBS
2006 Weekend Warrior FK1900