Received a call at my work from them. I work at a ...

Received a call at my work from them. I work at a secure facility so my first question was "how did you get this number?" They replied that they found my profile on LinkedIn and called my company directly. Very unprofessional. Next they asked if I had time to chat about an opportunity. I said "no". I'm working in an office and obviously don't want to chat with a recruiter with my coworkers around. She asked if she could set up a time to chat. Since I was unsure of the legitimancy of the call, I told her to contact me through my LinkedIn profile first. She said that she prefers to talk over the phone. I said again to contact me through LinkedIn and we can chat. She then said "No I'm no longer interested in talking with you". All I could say way "okay bye". Lol! Note to self, TechHi is a bunch of clowns.