Hero Motocorp — engine problem... when i the brought the vehicle the engine is problem and mileage problem

Engine problem when i brought the vechicle the hero maestro edge 125 is stopping and milege problem... I said to the hero worship they do correct it so only i complain to the head office..
Please correct my problem so as possible
The show room address and number
Suguna automobiles
No 4, avanshi road
Dr munuswamy garden road
Coimbatore-641018[protected]

Show room number[protected]
Please correct my problem