Su-Kam — not taking care of faulty battery ,cheating people

Address:

South Delhi, Delhi

I had purchase a Su-kam inverter on[protected], now battery is not giving the power backup so I lodged a complaint dated[protected] having complain no- [protected].Su-kam field executive visited on my place at[protected] and given me field service report having FSR no-133146 and Book no.-2663 that battery needs to be changed and told me that it will take around one week to replace your battery. But around two months have passed neither they replace my battery nor contacted me. And between these periods I repeatedly contacted to Su-kam customer care and their Area Sales in charge Mr. Swaroop singh .Each and every time they told me that your approval is on way and shortly you will be getting your battery. Finally today on[protected] they told me that your complain is rejected and you are not getting your battery because your warranty period is expire.
I am asking them that if I have lodged complain on[protected] their field service representative has visited on[protected] which is within the warranty period of 15 month from purchasing date which is in my case dated[protected] then how did they decided that my warranty is expired.