Hero Motocorp — demanding money in warranty period of motorcycle

Address:

S R Hero motors hariana punjab dist hoshiarpur, Hoshiarpur, Punjab, 144208

I had purchased new hero super splendor bike in feb. 2019 and a major fault occurred in nov 19 regarding piston and despite of within warranty period and with availability of full insurance they are demanding money in warranty period of motorcycle against major fault in bike. Agency contact detail is [protected], [protected], [protected], kindly hep in this matter.