|"i simply want the information for tracking purposes for the authorities"|
If you are going to report this then leave it up to the authorities to trace the miscreant (if they think it is worth doing). They know how to do it, which you don't, and have access to facilities that you don't.
But if you know who it is, why do you need the IP address? And if you know that it is happening how can they scam you?
As I said to start with, just ignore it.