Hero Motocorp — Service mileage issue

Address:	Bangalore, Karnataka, 560029
Website:	www.m.heromotocorp.com

Hi sir, i had my bike service in nidhi motors bangalore.. During service they changed my chain sprackets, oil change other such things which is there in the invoice copy-rs:1631. I complained them that my bike is not giving milage. Per 1 litre only 35 to 40 km. They told the reason for that is chain sprackets. Now after service again the same issue for 2 litrs of petrol am getting 85kms.
Again i went to them one of the supervisor did some changes within 5mins time.. Even now same issue.. I cannot follow them up bcz i tooo have ofc to work, only thing is if we do service in outside hero side they wont give warrenty. So i given the service in hero showroom itself. Please help me to get it resolved.
Name: shaik babji
Vehicle number: ap04ba2955
Andhra pradesh registration.

Nidhi motors: 281/8, near silkboard circle, nh-7, hosur main road, bangalore