wynns/phoenix auto warranty Canceled warranty, breached contract, made up rules as they went miami florida

Bought a 2015 Gmc Serria around the end of sept, drove it for a week, less then 300 miles and started having problems. bad control arms, leaking radiator, and bad transmisson. Took it to the shop, he dealt with the warranty and they approved to have the lower control arms done. he completed that work, then called them bacl about the radiator and transmisson. tthe warranty inspector had to come out and take a look at the truck. the are now denying all the claims and not paying for the work already done. because my truck has been modified. i bought the truck the way it sits. the contract states that the tires must be below 20% different in size. Im only about 8 percent so i should be covered. they said im not covered because the box was not checked that i had over size tires. but the dealer said, and showed me proof that their web site says only check the box if the tires are over 20% different. so no here i am with a 3500 bill for work they approved, a leaking radiator and a bad transmisson that wont get fixed under a warranty that was sold to me.. scam is what they are.