Power Train Driveline problems of the 2008 Volkswagen New Beetle

Dear madam / sir, two days ago I had and accident with my "2008 and still under warranty car". I dropped the car at the rockville, MD official dealer, then I called the insurance company and my insurance agent. The three (agent, insurance inspector and dealer) inspected the car and approved a $1,440 spending to fix it. Since I got surprised; I asked the reason of the very low repairing labor and parts exchange costs of a sub-frame vw part # vw1j0-199-313-m (large steel part to supporting the engine, suspension and transmission), transmission oil pan part #vw09g-321-361-a (place where the oil transmission is keep), and a center shield engine-transm axle a large and heavy underbody protecting metallic part. They said these days it is a common rule to recycle used parts from similar vehicles, and low costs of the "used parts" utilized to fix my car (no matter the key role of the parts). At this point I am asking myself: what about safety? in any way? not only used parts from other cars have not quality inspected, even worse I guess this practice encourage the cars stilling. Are we all (customers) aware of this?, is it any ". Org" or ". Gov" organization which regulates these used parts market? are we protecting our safety? can we as a customers complaint somewhere about this? please give me your opinion. Thank you so much.

While stopped at a red light, vehicle suddenly revved up and started to move forward, even though foot was firmly pressing down on brake pedal. Turned wheel to the right while vehicle was moving forward and moved the gear shift lever from "drive" to "park". Left front of vehicle made contact with rear of vehicle that was stopped in front of me.