Bangalore Traffic Police — Unlawful stop and harassment by Bangalore traffic cops

Hi,

Iv been stopped on multiple occasions by the traffic police during their start and end of month "fine collection drives" and asked to produce documents when i have not even broken any law. When i ask them what law I have broken they tell me i have a modified exhaust for my bike when mine is clearly the stock exhaust and other reasons like my bike was reported stolen.
Why are traffic cops illegally stopping people when no law is broken and also what number to we report these hooligans to. They just ty to fleece money of you and waste your time when you don't pay.