Boat — Headphone sent which was under warranty but not returned yet

Address:

2126, BNP Colony, Ambedkar Marg

I have purchased boat wireless headset from them but after some months i was faced battery issue for the same. Since boat provides 1 year warranty i registered complaint. They arrange pickup and collected the product for checkup. It was sent on may end but till now i haven't received the product back. I call many times to the boat customer care but the are not responding. And asking for acknowledgement of sending the product. I they arranged the pickup i dont have any acknowledgement.