2018 MAZDA MAZDA3 Vehicle Speed Control Problems

PURCHASED A BRAND NEW 2018 MAZDA 3 2.5L TOURING HATCHBACK. I HAD ONLY DRIVEN THE VEHICLE AS ITS NEW OWNER ONCE, FROM THE DEALERSHIP BACK TO MY HOME, WHICH WAS LESS THAN 20 MILES, WHEN THE FOLLOWING OCCURRED: I STARTED THE ENGINE FOR MY SECOND TRIP WITH THE VEHICLE, AND NOTICED THE CHECK ENGINE LIGHT WAS ILLUMINATED AND REMAINED ILLUMINATED. I DROVE THE VEHICLE AROUND THE BLOCK AND DID NOT EXPERIENCE ANY UNUSUAL DRIVING PERFORMANCE CHARACTERISTICS SO I DROVE TO MY INTENDED DESTINATION WHICH WAS ONLY 7 MILES AWAY. WHEN I STARTED THE ENGINE TO MAKE MY WAY BACK I NOTICED THAT NOW FIVE WARNING LIGHTS WERE ILLUMINATED AND REMAINED ILLUMINATED, WHICH CORRESPONDED TO THE FOLLOWING WARNING GUIDANCES: AN ENGINE SYSTEM MALFUNCTION, A DSC MALFUNCTION, A TPMS SYSTEM MALFUNCTION, ALONG WITH TWO SCBS MALFUNCTION WARNINGS. WHEN ATTEMPTING TO DRIVE THE VEHICLE, I FOUND THAT THE ENGINE WAS CLEARLY NOT RUNNING...

WHEN I LET OFF OF THE ACCELERATOR IT STILL MAINTAINS THE SPEED IT WAS GOING BEFORE I LET OFF THE ACCELERATOR. THE DEALER TOLD ME THAT'S HOW ITS DESIGN. HE EVEN TOOK IT FOR A RIDE AND SAID SEE IT STILL KEEPS THE SPEED I SAID ITS NOT CRUISE CONTROL. I HAD CONTACTED THE DEALER AND MAZDAUSA. MAZDAUSA IGNORES ME. I JUST NEED TO GET THIS FIXED BEFORE SOMEONE GETS HURT. WHEN I GO TO PASS IT STAYS FOR A WHILE AT THE SPEED I HIT BEFORE I RELEASE THE ACCELERATOR.