Kent RO — poor service after sales

I have purchased kent r o grand plus in 2019.
Whenever service is due, it is informed that same will be resolved in 48 hours. But after 72 hours also no technician comes to attend and provide services under warranty period.
When i m calling, kent service not getting proper response.
So overall kent product and kent service is worst i can say.
Because some of my friends who are using aqua guard & eureka forbes they don't face such kind of issue very frequent and also service response is far better than kent.
I do not give even single star due to worst service.