300?!?!

Well, as some of you know from reading this, I work in a call center. What some of you might not know is that I deal with banks all day long. One would assume, that the people who call me know what it is that they are "selling". So, when I got a phone call asking for a desk register, I assumed that the bank rep knew what it was they were ordering. For those of you who do not know, a register, is the "book" that you log your transactions in. Date, check #, amount, etc., so that you can keep a running balance. Now a desk register is bigger, as it is made for the 3 to a page checks. It is about 20 pages, each page has about 26 lines front & back.
So I was very specific when I verified that the customer wanted to order the register, NOT the checks. Yes, the register was what was asked for.
So my next question is, how many would you like to order? Well, imagine my shock when the reply came back as "300".
"Excuse me?, Did you mean 3?"
"No, 300"
"O.K., they are $ (insert price here) each"
"We want to waive the charges" They can do that on some types of accounts.
"That would be well over $3000 we would not be able to waive that"
"Let me verify how many the client wants......(insert hold music).....can we get 2?"
"Of course, I would be more than happy to place that order for you. Just for future reference, do you know what it is that you are ordering for the customer?"
"Ummm, no."
*sigh*
One of my co-workers laughs at me, saying that I create too much stress. I say, no, I just get frustrated because I have high expectations of others knowing how to do their job. I am trained, and do what I am supposed to and I expect others to know how to do their jobs as well. Is that REALLY asking too much? I try to put myself in the shoes of the customer, I empathize, try NOT to cold transfer the customer so they are not lost in the automated system for hours, I educate and explain..... things that I would appreciate if I was the one calling in. So how do these people get these jobs? Jobs where they have to deal with customers face to face daily. What is the screening process? And how can I get a job that seems like it would require skills, and a bit of common sense, but obviously doesn't require much of either?