Pureit / Hindustan Unilever — Product Issue

Team, i purchased a PureIt product ayear back worth of 20, 000 and exactly after a year it stopped working and the support team says Yes that's how it works. We need to change some filters which is 5000 rs.

It's like 25%of the original product you have to invest every year.. Why this is not mentioned while purchasing.

How legit is this business, 25% of the total product value cost for one single part and mandatory to change every year.