2012 BMW 750XI Engine Problems

ENGINE FAILURE (WITH ONLY 60K MILES ON IT) WHILE DRIVING AT 70MPH WITHIN MINUTES OF WARNING LIGHT SAYING 'DRIVETRAIN MALFUNCTION'. THE ENGINE SHUT OFF, CAR WENT INTO NEUTRAL AND I HAD TO MANUALLY STEER AND BRAKE TO GET TO THE SIDE OF THE FREEWAY. WITHIN MINUTES, THE BATTERY DIED, SO I COULDN'T EVEN PUT THE CAR INTO NEUTRAL TO GET IT ONTO THE FLATBED TOW TRUCK. I EVENTUALLY WAS ABLE TO GET IT TOWED TO THE DEALER WHERE I BOUGHT IT CPO IN 2015 AND HAVE HAD IT SERVICED (I HAD EVEN HAD IT SERVICED THERE 3 WEEKS BEFORE THIS INCIDENT). THE ENGINE HAD RECEIVED THE "CUSTOMER CARE PACKAGE" IN 2015, AND I'VE ONLY HAD IT SERVICED THROUGH BMW DEALERS. 3 DAYS AFTER I HAD THE CAR TOWED TO THE DEALER, THE SA TOLD ME THERE WAS A COMPLETE ENGINE FAILURE AND THEY WOULD REPLACE THE ENGINE. IT'S BEEN THERE...