I had a numerical "x != y" issue in December with my AC Account (who actually trusts the idea of an inexplicable (actual) USD666 Debit in this day-and-age), and held several lengthy phone discussions with CSR reps from both GS, and AAPL.
It consumed a hour from my living.
I was impressed by not just how patient and informative each rep was, but that they communicated and deftly transitioned the conversation between the three of us.
It was my math that was in error, but that ended-up being a personal revelation.
It felt like a 'we' thing, and I shared my appreciation (as best I could).
[egads! Reading-back, this looks like a Chat GP convo, but I swear that this content is bespoke!!]
I'm holding a zero balance, so exactly who maintains the Account really doesn't matter.
Heck, I may never, ever, use it again!