Boat — Boat 381 airdope not working

I got a gift from a friend, boAt airdope 381 nirvana around 11th july . After 2 months, one earphone stopped working followed by other after 10 days. I tried to call helpline number, it's not reachable . I also tried boat service centre- lalani infotech at raipur, they denied as it was purchased online.