Onsitego — Kent ro water purifier

I have purchase kent RO water purifier with 2 year extended warranty for Rs 18924 dated 15/08/2019 from croma store in ROYAL Meenakshi mall Bangalore. My water purifier is not working more than 1 month the first request i raised on 30/10/2020 for repair till today 29/11/2020 it not repaid . every time i am calling them than they are telling we will escalate the issues .Their engineer is also calling but never coming for repair. it is like metal harassments for me calling there customer care for service of water purifier . every they are having some other excuse not doing work. last one month i am purchasing water bottle from outside and drinking in covid time and putting my health at risk. purchase and getting service is a metal harassments for me