iBall — iball nirantar ups 622 model stopped working after 2 months

Address:

Bangalore, Karnataka, 560066

My iball nirantar ups 622 model stopped working after 2 months. I have raised a complain and has not been addressed since last 2 months. They came to replace battery but there was problem in main board and then said we need to order board and after that they are not doing anything.
I have called many times and they say main board is not available.