Bought a CPO car here that shook terribly when bra...

Bought a CPO car here that shook terribly when braking at high speeds and was at 50% oil life. None of this was disclosed when I purchased the car. When I brought it up to them I was told it s just wear and tear. Then tried to charge me 700$ for a front rotor and brake replacement when I went to get my first oil change. Salesmen was Marcin.