Engine Knocking Noise problems of the 2015 Volkswagen Jetta

​on June 10, 2017, I had purchased a brand-new car at prime Volkswagen saco, maine with full warranty on it. September 15, 2017, I was with my kids heading down to connecticut. In route on massachusetts 495 south at one point when I pressed the gas pedal to add more power to the car to speed up the car started to shake. I released the gas pedal no shaking occurred. I then again tried adding gas and it started shaking. I then also noticed my engine light had turned on. I was worried so I decided to slow down and pull over into the emergency lane to see what was going on with the car. In the process of slowing down and pulling over to the emergency lane, you could hear a banging sound to me it seemed to be coming from the engine. I called my road side assistance for them to come check out and check my car and they said they don't do that kind of road side assistance for engines that the vehicle must be brought back to a Volkswagen dealership. So, that night my vehicle was towed back to prime Volkswagen saco, maine where it was originally purchased. Three days later I received a call from the service department at prime Volkswagen and they said the fuel in my tank was not pure diesel fuel, that it was contaminated. They tried to tell me I filled the car with gas instead of diesel fuel. I had brought them the receipt when I last filled my tank. It was the morning of my trip heading down to connecticut. I had filled my car from an empty tank to a full tank at big apple on washington avenue right at the bottom of munjoy hill. On that receipt, it states I used fuel pump number three which is a diesel fuel pump. It also shows how many gallons were fueled and the price. After I showed that receipt to the service department of the dealership they then tried to blame the big apple gas station saying that their fuel pumps are contaminated.