Bought a new 2015 GMC 1500 with a life and tires a...

Bought a new 2015 GMC 1500 with a life and tires already installed. Was told everything was covered because GMC put these parts on so i still got full warranty. Brought it in for its first oil change and there was a squeak in the suspension. Was told they don't cover it. once i showed i was upset for being lied to the sales manager (Chris) told me to get my f$%king keys and get out. Currently underway with filing legal actions to get my money back for the truck. They will sell you a warranty but won't follow through. Truck had 35 miles at time of purchase.