Regarding after sales service from Boat for blue tooth earphones

I have purchased boat 255 wireless Bluetooth earphones last year and it started malfunctioning from early March and I raised complaint with boat as I have warranty and they confirmed me that they are going to issue new product. So real problem comes here when I returned the item I was in chennai so due to lock down I travelled to hometown and I asked them change the address. You will not believe it’s been almost 7 months they are not responding to calls or mails. So I got irriated with their service and decided to lodge complaint here and to not to buy boat products anymore.