@Alexandru5 : is it exactly the same amount, charged twice?
If it isn't exactly the same, but just very similar, it could possibly be the security deposit. I would check back on the listing you selected, perhaps they have a security deposit in place. In case they do, that could be the issue. In any case, that amount of money is not actively taken out of your credit card account , but has a "hold" on it. that could also be what you mean with "blocked" . Just an idea you might want to check on first. Good luck!
I don't see a phone number for Romania, maybe type "contact Airbnb " here into the search function, and yiu'll find the extensive help manual by Deb and Dave: Contact Airbnb - A community help guide.
in any case, what seems to work best is to contact Airbnb on their twitter account @Airbnbhelp. Have your confirmTion number ready, they will answer within a few hours at last. Good luck!