Livpure — Company not providing service after purchasing warranty

Warranty replacement was due on nov 24. I opened a ticket but no one came for replacement and ticket was closed on Jan 25 for another work where a paid part was replaced. The technician said that there is a shortage of parts from the company itself and they were waiting for the replacement for past 2 months.
Area head confirmed that the part had arrived in March so I opened a ticket on first week of march and the ticket is in "assigned" state but local service head said that they dont have my ticket.

Made multiple calls to Livpure customer care and each time they said that "a senior" would call me back within a hour, but no calls received each time.

Please assist/guide.