Hey @FLOREAN IULIA-IOANA ,
I am sorry to hear about the unexpected charge. The best way to get to the bottom of this would be to contact Microsoft support and have them review the charge. Minimally, they will be able to tell you were the charge originated from and insure it is canceled to prevent any further charges and at most may provide a refund for the inconvenience.
This link should take you to the ticket creation portal for Azure where you can select billing as the topic and get in touch with someone.