The headliner refers to the main entertainer of the the show that comes on stage after the opening/warm-up acts finish performing. You have to get through the opening acts before you see the one you actually came for.
A few years back you could say "operator" or press zero to get transferred to an actual person. In my experience it only works about 1/3 of the time these days.
Sometimes the system would even escalate your call if you were swearing while you were on hold.
Gaslight. Obstruct. Project. Ladies and gentlemen and everyone in between, this is what GOP truly means.