I do some shifts covering a live chat and social media platforms. So, fortunately I am a looong way away from the actual customers and, on the whole, they're pretty good... but..
One user was unhappy with a moderation action I took on SM - she broke the rules she agreed to on joining (the free group!), her comment removed, she was advised why.
She posted on the same thread, complaining - this was also removed. Then I put her on mute for 24 hours to calm down (knowing damn well it would not calm her down!)
She then messaged in-app to complain... typing in angry caps about how awful X (me!) was and how she'd been wronged. I politely pointed out I am X, I was upholding group rules. She demanded a refund and I had to tell her I couldn't give her a refund. Before I could tell her how to get a refund (app store!), she rang our freephone line...
I know this, because on shift, I answer the phone, as well as the live chat and SM...
She was so angry to find it was STILL ME on the phone, she swore, then hung up and then deleted her account without finding out how to get a refund, and probably thought that would cancel her pending subscription. Ah well, she'll have found out eventually!
We occasionally get people determined to hurl abuse at us, blaming us for awful advice on our specific topic that it then turns out, they read somewhere else and was nothing to do with us! I ask them to copy and paste where they got it - to date, it has never been anything we've published!
The ones that make me laugh are the refund requests that start 'I forgot to cancel my free trial'... I know we all do it, sign up intending to cancel before we have to pay... but they don't realise they're not talking to chatbots, and then they realise how cheeky they actually sound (some, not all... some couldn't give a flying fuck!).
Reading this thread, I am SO glad the worst that has happened is I've had mildly angry people on the phone or the lady who wanted to ring me for an hour EVERY NIGHT and treat me like her new best mate... I couldn't work customer facing IRL for a million quid!