2016 Jeep Renegade

MY CAR "SERVICE ENGINE" LIGHT CAME ON AS WELL AS A MESSAGE ON THE DASHBOARD WITH THE WORDS "SAFETY ASSIST" AND "SECURITY". I IMMEDIATELY BROUGHT THE CAR TO THE DEALER. AFTER 2 DAYS IN THE SHOP, THEY SAID IT WAS (AS POSTED ON THE PAPERWORK RELEASED TO ME) "CYLINDER 3 MISFIRE AND COLD START ROUGH START. FOUND CYLINDER 3 PLUG FOULED OUT POSS FROM MOVING VEHICLE ALL WINTER WITHOUT EVER DRIVING VEHICLE. REPLACED #3 SPARK PLUG, SWAPPED COIL #3 WITH COIL #2 TO SEE IF MISFIRE MOVES TO CYLINDER #2. THIS WAY IF CONDITION IS NOT RESOLVED, I WILL KNOW IF COIL IS BAD OR ENGINE HAS A MECHANICAL PROBLEM. RFH FLASHED AND ABS FLASHED" THEY RELEASED THE CAR TO ME AND SAID IT WAS FIXED AND SAFE. UPON DRIVING TO WORK AT 5 AM, IN THE DARK, I HAD NO EXTERIOR LIGHTS AND COULD ONLY USE MY HIGH BEAMS IF I HELD THEM ON. I HAD NO BACK LIGHTS. CARS APPROACHED VERY CLOSE TO MY CAR AND I HAD NO IDEA WHY. WHEN I GOT TO WORK, I HAD ANOTHER WORKER CHECK THE BACK OF MY CAR AND THERE WERE NO BACK LIGHTS OR BRAKE LIGHTS. I CALLED THE DEALER AND LEFT A MESSAGE AND DROPPED THE CAR OFF AFTER WORK. AFTER FURTHER REVIEW, THEY HAVE NOW TOLD ME THE ENGINE NEEDS TO BE REPLACED....ON A 2016 CAR. RIDICULOUS. THANK YOU *TR