2014 LEXUS IS 350 Wheels Problems

I PURCHASED A 2014 LEXUS IS 350 F SPORT FROM FORT WORTH BROTHERS, LLC/ALFA ROMEO FIAT IN FORT WORTH, TEXAS ON JULY 20, 2018. I NOTICED THE NEXT DAY WHILE DRIVING THE CAR AT HIGHWAY SPEEDS THAT WHEN APPLYING THE BRAKES, THERE IS A "RUMBLING/GRINDING" NOISE AND THE CAR WAS HARD TO STOP. I WENT BACK TO THE DEALERSHIP THE NEXT DAY AND TOLD THEM. THEY CHECKED THE CAR AND SAID THEY FOUND NOTHING WRONG AND THAT THEY RESURFACED THE ROTORS. WHEN I LEFT THE DEALERSHIP, I CONTINUED TO HAVE THE SAME PROBLEMS WITH THE BRAKES. I ALSO TOLD THEM THAT THE CAR "SHIMMIED/SHAKING" AND "VIBRATED" VERY BADLY WHILE DRIVING AND THAT THE CAR NEEDED NEW TIRES. THEY TOLD ME THEY HAD PUT NEW TIRES ON THE CAR, WHEN, IN FACT, THEY HAD NOT. I CONTINUE TO HAVE PROBLEMS WITH THE CAR RIDING WITH A "SHIMMY/SHAKING" FEEL WHILE CRUISING AT...