Hero Motocorp — irresponsible behaviour of service centre

Address:

Patna, Bihar, 800020

Hi
I have cvz extreme, i have given this bike to chandan hero service centre, kankerbagh main road, patna, bihar for reparing on[protected], at that time they have opened the job card and told me to deposit advance of 4000 rupees i deposited the money then they told me that your bike will be completed in one week.
After one week the work is not done same condition is maintained by service centre every day, till date no work has been done in my bike, after about two month i am compiled write this to you, kindly look after my problem,
Thanks