With my Medicaid insurance carrier, long ago their automated system quit recognizing my member number, whether I recited it carefully, or typed it on the keypad. It would steadfastly pretend not to understand me. And I believe that this was somehow deliberately configured in their system, perhaps as an anti-fraud measure or perhaps just to spite/stymie me from frequently calling in. And it certainly would slow me down, especially when I was in a public place and valiantly trying to get something done by reaching out to them (their services included arranging rideshares/taxis, and so it was not unusual for them to fuck that up, thereby prompting me to call in and try to unfuck my ride home from the dreary, awful, vampiric medical clinic where they'd dumped me.)

So I have become accustomed to feeding it gibberish. I will type-in or recite nonsense numbers. It always takes 3 tries, 3 identical failures, before it routes me to a human anyways (the gatekeeping is simply an attempt at automatic authentication before the manual, human auth kicks in.) The most efficient way to get beyond that gatekeeping is by triggering unambiguous failures to authenticate.

And it is kind of funny; I don't know what is supplied to the humans' screens, but they are sometimes perplexed when they receive my call and I've just finished spouting gibberish to their ignorant robot bitch.