Hero Motocorp — Collecting Money for Zero Bill and Changing my number in records without my permission

Address:

C.P. Reddy Automobiles - Hero MotoCorp, Door No 6, 5/4, Main Rd, Tyagaraja Nagar, Rajahmundry, Andhra Pradesh 533101

I went to service in CP reddy Automobile located in Rajahmundry. the actual bill was zero because my bike was on warranty. but they collected 600 rupees. I asked for the bill. they refused to give the bill. I thought I will check in the mobile app. after that I went home. after one hour they changed my number in the record to some other unknown number to stop me to get the bill on my mobile. changing my number in my records without my permission is a crime. collecting money for zero bills is illeagle. please take action and give me justice.