No return call from nurse manager, should I keep calling?

I went in person to apply for a job one time. The reception person excused themselves for a short time. I noticed a lady come toward the office. What I did not know at the time (but something gave me an inkling), was that she was the DON and she came to the office to clandestinely look me over. I was interviewed, then hired. When you go in person, you give yourself an advantage over just sending some sheets of paper that can be lost, misplaced, ignored, or tossed. I always go in person to apply for jobs.

All the jobs I have applied to are also on line. I tried to go into several hospitals to apply in person and they just directed me to a computer to do what I could have done at home. Total waste of time!