Hero Motocorp — service issue

Address:

A39 sector 58 Noida, Gautam Buddh Nagar, Uttar Pradesh, 201301

Hi,
My scooty have been serviced through your agency, they didn't changed the engine oil. After getting the service, i drove my scooty for 7-8 kms then the engine became seased. I tried reaching your agency from where the servicing done (Sector 58, noida), they toe my scooty on 28th july to their agency. Then they promised me to deliver it on very next day. But still i am reaching them out to deliver it to me and it's now 8 august and i am not getting proper response from them.
My vehicle no. Is up14 db 1521.

Please provide me resolution on this as i am not getting good response from the agency otherwise i will have to some other action accordingly.