Hero Motocorp — Not getting the proper mileage

Address:

380013

I bought my Hero ' Maestro edge' on 19th December 2015 from Ahmadabad. Its been 4 months and 2 services and Its been 2200 km but still I am not getting the average I am supposed to get When I bought the vehicle the dealer told me that company claims 68 kmpl so you might get at least 55-60 kmpl but even after this much use I am getting hardly 40 kmpl which is very low for me.I asked for check up in last service but they could not resolve the problem. Please correct my problem or else GIVE ME MY MONEY BACK.