Bajaj Automobile — over charge by bajaj bike service centre

I have bajaj discover 125cc on 6aug2020 i decide to take my bike to authorised bajaj service centre in my village near neemrana there are service and chain set i want to change in service and my bill was rs 2760 when i ask pls explain me the charge how you charge this they not disclose anything even without informing me they change some part self. When i ask him to show me the original box of chainset they not show me and on every part which they change they charge extra cost i want my refund from company & close this type of service stations employees dont know how to work professionaly with brand name.

My name-manish yadav
Service centre name-salasar automobiles
(Ateli road, kanhawas barrier raj.)
Service centre no-[protected]