Microtek International — Faulty home inverter Super power 1100 12v sinewave

I recently purchased home inverter from the retailer. After fixing it, we used to have a kind of humming noise at home. It is unbearable. I filed the complaint with microtek. Technician reached and said me that microtek inverter will have this kind of noise. Iam really frustrated on hearing this. I used microtek inverter before it works fine but the new one has this issue. I am helpless now. Please help