The company I work for was recently acquired which has caused some uncertainty regarding my continued employment. To cover my bases I started looking at potential opportunities. This included switching my LinkedIn job search to looking for opportunities.
About a week later I received a call to my work phone, which I confirmed was direct to my extension. My extension is not publicly listed, not on my profile, and not in a directory on the phones. The recruiter was from a well established service in the area, and noted that he knew he was "catching me at work". This is unprofessional at the least, and unsettling as well due to the private nature of my extension.
This began to worry me, thinking that the new acquiring company has seen my job search status on LinkedIn and is using a recruiter to get an idea of what I'm doing. Since the new company is not my old company it is quite possible they were shown my status if they were looking for applicants in that field.
TL;DR: Do companies use recruiting services to spy on employees, and if so how should I proceed?
Edit: Never been listed in the extension directory, never had a business card. The Amazon Business thing sounds like a likely culprit.