I got a similar call today.  I had posted a question on the Community site.  While I was on the support chat with Intuit, I got the phone call.  This guy wanted to screen share.  It didn't seem necessary, so I asked him for step by step instructions.  He was impatient and didn't want to wait until the situation was resolved.  He said again he needed to screen share.  I asked if he was with Intuit, he said he was not.  I asked how he got my number.  He said it was from my Community post.