The real kick in the pants these days is spending a lot of money on something and trying to contact customer support over delivery or warranty issues. I'm convinced they just want you to give up and keep the sale (and lose a customer?) over ever resolving an issue. Or there's some internal metric that they're tracking that looks great and no one has ever actually used the system themselves.
Having led customer support, this grossly misunderstands how people interact. People don't read. It's as simple as that. You can write something as clear as day in a FAQ, and they don't want to put in the effort. ~50% of the inbounds I receive are fully written out in plain language in an FAQ.
LLMs are perfect for this scenario. It puts the answer in clear english and will endlessly re-word the answer when clients followup.
I don't know what others normally call customer service about, but in my case it's always something broken or a refund. The refund is doesn't need the AI, that's easily done with just a form. If somethings broken at my ISP for instance, then it doesn't really matter if the LLM or a form and some if-else skip-logic thingy sends the ticket to technical support.