This number has been active for quite a while now, answering only as “support”
Their latest blog spam blasts suggest they are impersonating Pluto TV, after doing the same thing claiming to be Microsoft
Back to wearing the hat of insignificance
8664500168 PlutoTV support was Microsoft tech support
https://ideas.powerapps.com/d365community/idea/df64d092-590a-ef11-a73d-6045bd7e85fa
https://medium.com/@jndnd947/does-micro-soft-have-live-customer-support-1-866-450-0168-d8087687d949