Problem with fuel injector

I have driven car for around 40,000 KM. During my last trip, while driving on highway, all of sudden, car slowed down and engine started vibrating. WHen I brough the car to service center, they told me to replace fuel injectors. Each Fuel injector cost Rs 23,000/-. According to them, fuel injectors go bad, due to contaminated diesel. While they said only two have gone bad, but suggested to replace all four. We have no control on fuel we put. It is faulty design of fuel injector by VW. They have to replace with newer design. Now every now and then we cannot replace the injectors.

I have seen many complaints on this, but VW is not doing anything. I am not able to understand why fuel injectors are not repairable. Because now a days, all engines come with electronic controls, unless we know exact control system, we cannot attempt any repair.

Comfortable to drive and good feelingHigh on maintenance.