Havells India — worst service from havells for purifier

I purchased a Havells Purifier last year in October 2019.
There was a registered request in March 2020 for service so that they change the filter.
As on today, no one came even after repeated calls to customer care.
It is now trend to justify everything with COVID-19 and lockdown.

In the next 2 months, the warranty is going to be void as it will complete 1 year.
Therefore, from March 2020 till today, I have already wasted 6 months of warranty.
The customer executives and the senior employees, all of them are stupid and good for nothing.
They did not even acknowledged the issue with their service.