Boat — Boat rockerz 380

I had buyed a boat rockerz 380 wireless headphone on 19/5/2020.
After using it for two weeks it was not working properly.
So i registered a com plaint in the website of imagine marketing private limited. They approved my complaints with ticket number 1182423. And i got the conformation e - mail also. The product was picked up by delhivery private limited. After two weeks i got an email conforming that the product has been recived in the service center. The i have not recived any mail from them. It has been one month and i have not recived the product. Helpline number of imagine marketing pvt is not working since last one month.