Hero Motocorp — misbehave from technician

Today i gone through my maestro edge service in waluj midc aurangabad. When completed i tried for indicator it was not working. So i called technician and shown, he told me to change the part. I told i won't do as when given bike it was working. After that they found problem in their wiring and rectified. When i said technician that it will be unnecessary change and you will take money also. He told we will ask and you will give and started arguing and also told you go also 1000 other customers are there in waiting no problem for me.