Su-Kam — 5kva commercial ups/inverter

I had Installed 5Kva SU-Kam Commercial Ups/Inverter at my Petrol Pump at Shamsabad, Dist. Agra which is under warranty. I logged a complaint of non-working the same 5kva inverter on 02/07/18 with Compl. No.81535c[protected] on Co. Toll free no. where they advise to wait just 12-24 hrs where Co. eng./attendent will visit and check the product on site.
5 days have passed and no one came and re-solve the problem due to which i had suffered a lot of loss by fuel in Silent Generator regularly from last 5 days whenever power supplies cut-off..
This is real cheating by Su-kam who commits to re-solve the complaint within 12-24 hrs. I am regular calling the cell no.[protected] of local service Centre Incharge Mr.Hajarilal whose no. was provided by Co.'s toll free no..It is noticed that in support of Co.'s name he use to provide service on priority to the customers who personally makes tunning with him and pays his Eng. or to him confidentialy.