Hi @Michele30
You must had enabled the Airbnb smart pricing,
https://www.airbnb.com/help/article/1168/smart-pricing--set-prices-based-on-demand
To turn off Smart Pricing
You can always go back to your previous prices or edit your prices. To turn off Smart Pricing:
1. Go to your Manage Listing and Calendar page
2. Click Pricing Settings on the right hand corner of the page
3. Click Smart Pricing and toggle to turn off
If you need to contact them, they reply pretty fast to Twitter @AirbnbHelp
Here is the contact numbers
United States 415-800-5959
855-424-7262 (toll-free)
Argentina +54 11 53 52 78 88
Australia +61 2 8520 3333
Austria +43 72 08 83 800
Brazil +55 21 3958-5800
Chile +56229380777
China +86 10 5904 5310
400 890 0309 (shared-cost)
Denmark +45 89 88 20 00
France +33 1 84 88 40 00
Germany +49 30 30 80 83 80
Greece +30 211 1989888
Hong Kong +852 5808 8888
Ireland +353 1 697 1831
Israel +972 3 939 9977
Italy +39-06-99366533
Japan +81 3 4580 0999
+81 800 100 1008 (toll-free)
Mexico +52 55 41 70 43 33
Netherlands +31 20 52 22 333
New Zealand +64 4 4880 888
Norway +47 21 61 16 88
Peru +51 1 7089777
Poland +48 22 30 72 000
Portugal +351 30 880 3888
Puerto Rico +1 787 919-0880
Russia +74954658090
88003017104 (toll-free)
South Korea +82 2 6022 2499
+82 808 220 230 (toll-free)
Spain +34 91 123 45 67
Sweden +46 844 68 12 34
Switzerland +41 43 50 84 900
United Kingdom +44 203 318 1111