Su-vastika — Complain about only three months old inverter which not accepted by company in so many days

Here I infom you that I have bought an invertor of Su-vastika company on the dated 16.01.2021 .
But there are some problams come again and again in this. But There is no pay any attention by the company about my complains.
So now I want return it to the compnay and want return my money which is paid by me to the company.
Thanks
With regards
Meenu