Boat — Aavante bar 1550 not working

I have purchased boat avantebar 1550 model, super product bass booster in this price range, purchased on 28/10/2020 after 4 months o[censored]sage suddenly stopped working HDMI and other ports are nit not working and bass also very low. I have logged 1st complaint on 28/03/2021 logged so many complaints, service center called me arrange engineer but still now not resolved my issue. I have requested to replace of refund, both also not done.
My ticket nos 2192877, 2425858,
EG district, AP not having service center to visit. Pls help to get my warranty support from boat.
I trusted but failed... Hope better it tomorrow