I occasionally get not so professional customer care agents, but overall Airbnb support is wonderful. Especially in very urgent situations they never let me down. Response time is good compared to other platforms, that might even never answer you. If they do mistakes, at least they can admit and always try to correct.
If you are calling this company with bad words, then you are going too far. Try to be a partner of Booking and you will see, that only partner, who exists is them.
Host, who mentioned that she has double listing... Really? Now Airbnb is responsible for your double bookings? Waiting for Airbnb to solve your own problem (unless you have a memory loss) instead of spending 20 seconds to turn off your second listing is...mmm not smart decision.