Yamaha Motor India — Complaint against service centre okhla phase 2

Address:

F-26/4 okhla industrial area phase 2 new delhi 110020

I was getting service done by yamaha service center in okhla, in the first they have charged me 3000rs and told me that they will charge certain parts of my bike, my bike was good in condition before but after getting service from this service centre my bike started giving issues in engine as well as mileage and after then when i did complaint of it they started using abusing words with me and not treated me appropriately . And they have not changed the parts, they took money from me for the new parts and still its 20days now they haven't changed it... kindly take strict action against this service centre...i am extremely exhaust now by coming here ... please help me