Su-Kam — shark-1000 inverter not working automatically when ac supply is cut off

Address: Sindri, Dhanbad, Jharkhand, 848204

Dear sir,
Please note the complaint against your product shark-1000 inverter, the complaint that" when the ac supply (220 v) cut off the inverter is not take up their sensitive automatically, this problem faced near about 2-3 days. Several times i try to connect with service centre/call center of su-kam ([protected]/[protected]) but anyone not take the call.
Kindly consider my problem and shoutout it at earliest possible.

If any queries, pls contact me : [protected]