Hi @Nathalie1140 .
I'm so sorry to hear about things going wrong on your recent trip.
It's so frustrating when things like that happen isn't it? And it doesn't really help that it is no ones fault.
You're not going to like what I 'm going to say next, but very unfortunately this is the 3rd story like this I have read recently - ie airbnb promising to cover a hotel bill, and then failing to follow through. In at least one case the guest had this in writing, but they still spent months trying to be reimbursed - I never heard whether they were successful or not.
My very strong suspicion is that you will do your head in going around and around in circles with airbnb customer support, who are usually woeful. ( they are just as bad for hosts - not that it's any consolation with your current predicament.
Some people have reported that they get a far superior quality or support when the contact customer support via twitter or facebook so that might be worth a try.
If you feel very strongly about it ( and I would) airbnb really don't like bad publicity. If you are prepared to go to the media you may very well get a different outcome.
An experienced superhost and guest, @Gordan reported that when a similar thing happened to him a while back, he WAS fully reimbursed to stay at a hotel.
This is the trouble with online entities - you can't report them to any authority as they are stateless. Publicity seems to be the best option.
Perhaps other hosts might have better advice.
Good luck!