Hi @Gabrielle53,
Welcome to the Community Center!
I'm sorry to hear that you've been charged twice for this booking. I would suggest that you contact Airbnb about this to check the status of getting this money back. This Community Help Guide explains the best ways to contact them.
Just to let you know, I have moved your post here to a new thread so that it doesn't get lost in another discussion and it is easier to find. I have also given it a title, please let me know if you want to change it!
In case you're not sure how to start a new thread - this CC Tutorial gives a step by step guide to starting a conversation in the Community Centre.
I hope you have fun in Barcelona!
Kirstie