Oh vs Zero

I have a work ID. It contains the letter O. All of the work IDs at my work contain a combination of letters and numbers. When you call around to different departments, they verify you by your ID before releasing any information to you. Fine with me. Except, every time I call and give my ID, I always say XXX-Oh-XXXX and then the first thing the person asks me is, is that Oh or Zero?

And I want to say, if it was fucking zero, don't you think I would have said zero? Because I didn't, I said Oh. I've had this ID for forever, you moron. I think I would know by now that if it was an actual zero to say zero, no oh.

Just a little thing that makes me mad.