Su - Kam — Replacement of shark inverter 850 va inverter

Had bought a shark model 850 va inverter on may'2014. Within 1 year of service its process control board (Pcb ckt) has been replaced twice.
Now the same problem arises again and upon confirmation from the su - kam service engineer it has damaged once again.

As iam residing away from my home, my father is facing lot of trouble due to this.

I want urgent replacement of the product.

Hence, requesting you to look into the matter and do the needful.