I have an Airbnb support horror story too.
I reported the space being poorly cleaned first thing in the morning (I had arrived at 1 AM). They asked if I preferred a phone call or chat. I didn't want to spend a morning on the phone with them, so I chose chat.
Every 20 minutes for the next few days, I got "Hi, I'm NAME_HERE, and I'm taking over your case!" The names changed, but they never actually _did_ anything beyond "taking over" the case. I felt like I was in a Seinfeld episode.
One of them then decided the best resolution was to tell the host I'd complained about the cleanliness (without including me at all). I started getting nasty messages from the host, who thought I'd happily stayed there for 4 days and then spontaneously opened a complaint. So now on top of sleeping in a gross Airbnb, I was getting constant notifications on my phone of the host calling me all sorts of nasty names.
I opened a _new_ ticket and chose phone support to finally get a hold of somebody. Her accent told me she was in an offshore call center, but she was helpful in getting it resolved. I think they had me book a hotel for the remainder of the days and reimbursed me, or something to that effect.
After I checked out, the host filed a frivolous damages claim against me. I clicked the "not my problem" button and thankfully never heard about it again.
I will never, ever use Airbnb chat support again. Was perhaps the worst customer service experience I've ever had.