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One of the main reasons why it isn't so simple is partially, as mentioned previously, most of the victims feel either too shy or scared, maybe due to the outcome and do not wish to come forward. They may feel that they cannot share this with anyone, as the listener may interpret her as one of these gyals who checks the lads and is one of these typical Punjabi gyals.
As "on-lookers" all we are able to do is promote the issue, and make people more aware of the situation at hand. A forum like this one is an exceptional idea to spread the word and/or passing the information through mates.
There are simple ways in which to decrease the risk of these cases arising. Common methods are going with a mate to the Gurdwara, another method could involve making it obvious that you're recording him on your phones. This use of mobile phones will certainly intimidate him, and make you seem less vulnerable and more in control of the situation. Remember, they target gyals who seem easily intimidated and shy.
I've mentioned before by recording the events as a written log, or even going to the extent of photographing/recording the "ghianis" by using mobile phones. This will create a visual profile of them together with the written log notes.
But hey, maybe that's going to the extreme
Spread the Word and Raise Awareness.