I want to work for a certain global business at one location. I am open to other locations but I have visited a particular one and find it my ideal environment. I feel I am qualified for the job and have applied to two others there in hopes of just getting my foot in the door.

I want to be more assertive in trying to get this position. Should I show up and ask for a manager? Should I call and see if someone is available to talk to me? Should I mail a resume??? What can I do?

yea you should do, they say they'll get back to you but it's more than likely never gonna happen, when you take the time to show up or even call, it shows you're committed and they'll take that into note