Hey, Yo, I Beeped You…Why You Ain’t Call Me Back?

Why is it sooooo difficult to get anyone in a customer service position to call you back? I work in the service field and deal with anywhere from 15-50 phone calls each day. Of course, I can’t answer the phone every time, especially if I’m on it, but how hard is it to call the person right back? I’m currently dealing with: a) a kitchen/cabinet supply company whom I’ve been trying to get a call back from for about 6 days now, b) a mortgage lender who said she would call me on Monday after I called her twice on Friday and then just showed up at her office Friday afternoon and happened to catch her (she did not call Monday and I just left her another message), and c) a gas line installer person who said they would call me Saturday with an estimate, but only called me back Monday afternoon after I called them. What’s up with that? I mean, at least just call me and say “I’m not ready yet, give me another day or so” or whatever. It would not be so frustrating if it didn’t seem like everyone was ignoring me. If it was only one person not calling back, I can give the benefit of the doubt. I’m nice that way. But please people, if someone calls you, JUST FRICKIN CALL THEM BACK!