Harman India — Electronics/ Sound bar purchased from Harman not working.

Placed a booking for sound bar infinity brand on 19 th sep . Product received was defective . It's confirmed by technical team who came for demo. And I further contacted Harman customer support. Though they agreed after sharing all the relevant details with proof that product is defective. They are still not provided the new one as replacement. Tired of repeated follow ups. Leading to more frustration.
Not sure if they will do also ... I am feeling so depressed with this issue. Kindly help.its already a month now.