Where to report big corporate spammer

Question for all: There is a social media site for physicians called "Doximity." It is supposedly built around a secure email system for confidential info and if you Google them there is lots of positive industry press about their business model and what a wonderful success they are. However, their MO is to crawl the web for associations between docs--institutional, med school, training programs, etc.-- and send people email that falsely appears to come from those connections. Suprisingly there is virtually no mention of this, but it's very sleazy and annoying. You can't opt out of these emails and I have written to them several times asking them to stop. I finally lost patience this weekend when I got an invite from a much loved colleague who died tragically from cancer last spring and whose absence is still raw around here.
I think this might be minor grist for some journalist's mill. Do any of you movers and shakers know anyone?
Thanks.
I think this might be minor grist for some journalist's mill. Do any of you movers and shakers know anyone?
Thanks.