right. it's likely that there is no uniform policy on what upload speed would be set on a connection.
best is to get an official word on what upload speeds should be on a particular plan. and than push for it.
@Sushubh Yes, but they are not entertaining their customer at all in this concern. I have got my modem replaced today, line checked but still the issue is there. I have been going through this since last week, tweeted to Airtel also yesterday.