I'm not sure mine will work
because I am logging on from the UK.
But when I log in I see Report Abuse bottom right and the link for that is https://support.live.com/default.aspx?productkey=wlpeople
In the next page that list where you can see Profile Abuse. If you see the same list, can you see 3 above that, "People Abuse"? My link is https://support.live.com/default.aspx?productkey=wlpeopleabuse
I can only suggest that one because I tried some of the others and they didn't seem to fit.
But in People Abuse there are options to select the type of abuse, perhaps "Other", and also to state exactly what the abuse is.
The only sticking point there that I can see is "Location of Abuse". I can't see one that fits,so I would use Network.
Try that and see if you can send a report.