Hero Motocorp — very bad service and behaviour

Address:

Alappuzha, Kerala, 689121

On 10/02/2018, i went to hero motorcorp service centre new millenium motors at chengannur to change my vehicles cable comp throttle and to clean its drive chain. But after i got the vehicle its fuel tap got damaged. They drained my fuel tank with out my consent and the tube not fitted properly. Due to which i lost all my fuel left in the tank.
On 12/02/2018 i went there for complaining the issue, but they shouted at me in front of other customers and neglected to resolve the issue. After that i went to a local workshop and fixed the issue.

I didnt expect such a worst behaviour from such a reputed firms service centre
Attaching the bills for reference