Hi! So they (bank) replied that one payment is charged and the second payment is blocked and is waiting for being charged. You have to cancel that blockation by sending mail to aneta.belingerova@fio.cz.
Here is their message (translated from czech):
Dear Mr. Trávníček,
Thank you for your inquiry. Unfortunately, this payment can not be canceled. The amount that is blocked for payment card transactions and is not to be posted will either be canceled either by the merchant or by the expiration of 30 days.
If you could get a message from a merchant that he will not claim the amount, please send us the communication to chomutov@fio.cz.
Thank you for your understanding.
If you have any further questions, do not hesitate to contact us.
Regards
Bc. Aneta Belinger, client worker
tel .: +420 224 346 984-5, e-mail: chomutov@fio.cz
Fio Bank, a.s., Square 1 May 91, 430 01 Chomutov
http://www.fio.cz