Jaquar — Defective bath tub

I purchased a bath tub (Jaquar - JBT-WHT-FONT150)) from Katta ceramics paying Rs. 21574 bill dated 05/01/2022. Upon installation there was water stagnation with incomplete drainage from the tub. This was immediately flagged up to Jaquar customer care and after repeated visits by their technician the bath tub was deemed defective and a replacement was promised. But despite repeated complaints and follow-up this has not happened and the installed bath tub is virtually unusable. I have lot valuable and time and effort chasing both Jaquar and Katta ceramics.