Pureit / Hindustan Unilever — Fraudulent service agency

As I go through these complaints already on board, I think I too should bring out my issues in this forum.
I too Pureit ultima RO +UV, just 4 years before bought. Every six months the GkK 1 or 2 goes off. The agency assigned to this area comes with the spare parts which do not have the brand name or logo in it, every time. I noticed this very recently when I visited their web site. When I complained the customer care and requested to change the agency, they are telling it’s not possible.
Now the complaint is my unit too is having PCB which went off immediately after changing GKK2. These service guys are not professionally qualified I guess. I have complained several times to the customer care via email but no reply to any single mail.
Is this the product worth of what we paid around 20K? Every six months changing any one of the gkk? And finally pcb gone in a short while? Is this the standard of the support level from company, not replying the emails even? Didn’t expect this from the great grand brand HUL..

The duplicate items used by the agency is not questioned by the company nor do they give any solution. Simply pick up the call, and assign the complaint to the same agency, not understanding the nature of the complaint? Is it a monopoly for the service agency of this location?
The worst ever customer support in the industry. Highly condemn this kind of attitude. I would think of taking up with consumer court.