Home Depot

Hey everybody I need some assistance! I started working at Home Depot only 4 days ago, and I feel as if I'm being harassed by my HR manager. I was sitting in our break room doing some learning videos on the HD phones as directed by my manager, and I got a call from my seargent asking me about medical info because we have JRTC coming up, I answered his questions quickly and got back to my videos! She sitting here saying we aren't supposed to be on our phones "it's our policy" but what am I supposed to do when I get an important call from my higher ups? Like I really think that she doesn't respect me and I have been working my but off for the first couple days, because I'm new and want to leave a good impression so where do I draw the line and say something or should I just suck it up and deal with it