Microtek International — 1100 SW 12v

I bought an inverter from Microtek dealer from Chennai in July 2022. I noticed that when power goes off my LED TV starting. I raised complaint in Microtek customer care. The service man came and tested with a board he brought. Not solved the issue. Next another complaint registered. This time they took the inverter to their Chennai service center. After a fs they brought back and installed then tested. Not solved the problem. Like this 5 times the different different service men came. No use. The broke my mains 4 pole isolator switches. Not yet fixed it.
Please refund my money and take your inverter.
Thank you.