Volkswagen India — engine lamp warning/throttle valve and purge valve complaints

Address:

Volkswagen Guntur

Hi, i own a vw polo which i had bought on 2017, since i use it very occasionally (Its like third vehicle) and i ran about 20, 000 kms in three years span and i consider it as a low usage, so after getting the engine lamp warning i took it for a service check in vw auto guntur, the same place where i purchased the vehicle. The service incharge have told me that the throttle valve and purge valve isn't functioning proper and changing them cost about 50k. Seriously? I've other 2 cars ran about 2lakh each in a span of 5 years and never got such engine issues!
I want to raise complaint regarding this. I am not going to pay hefty amounts for such low usage.