Kent RO — Poor quality filters

Address:

Kent, Delhi

I have Kent RO water purifier at home.
Whenever I call technician for service my experience is that they change whole filter set. I have done one such change on 30th of March22 and exactly after 3 and a half month, my filter is not working. Upon calling technician, as usual he started replacing right from external filter, solenoid, RO filter and so on. When I enquired about the warranty of previous filter he said it was only for 3 months! My question is if they can guarantee only 3 months for 5000 Rs worth filters, then why do they do this business?
They are simply looting the common man.