Other Fuel System Hoses Lines/piping, And Fittings problems of the 2012 Mercedes Benz ML350

My Ml350 is over over 71000, no warranty. I noticed that it has been stalled several times till incident. Last Tuesday, suddenly car engine stopped in the usps parking lots, middle of driveway, no moving. It was around 6pm, I called road servise and first guy came who didn't know about mb, and 2nd guy said it might be out of gas. I filled up full one day before, so tank was not empty. 2nd guy didn't know exact reason, and needed to tow. My car has been towed to dealer late night. Next day, I called dealer but they didn't know what is a problem or not checking yet. 2 days later. I stopped by dealer(because they never called me back), and sales person said needed to order a part and cost $700, so should be ready on Friday. (car towed on Tuesday). Sales person never called me back on Friday again, so I stopped by dealer. Sales person said, my car needed to change fuel pump and cost will be $1530. Off course, I complained!! my car is ready today, 8days after towed. I rent a car for a week and paid $300 by myself. Delaer gave me a little discount but paid $1200. Total my cost is $1500. They changed control unit, fuel delivery module, and fuel filter unit. Also one is racall #2013110002 fuel sys ecu has been replaced. (software) I think this is safety issue. I was lucky without any accident.