Hero Motocorp — Ismart problem regarding mileage

Address:

229001

I purchase i smart from raebareli on dated 27 jan 16 .your company garanteed milage of this bike is 102 km/lit .i service 3 to 4 times and want to fix issue but unfartunately not solve and company decleared data is totally fake.i cimplain in dealer so many time bt no issue fix all say its company falt and say go and file case to company so plz tell what we do????