@TapiocaChip A friend in business had once mentioned that a Rs. 500 legal notice usually does the trick. Any local legal professional should be able to help with that. Haven't tried myself but you might want to explore.
@TapiocaChip I was in a similar position when I was freelancing. You could find an advocate in your city on Google and check with them once. In case we are taking about a large sum, I could connect you with a corporate lawyer friend.