Hi Jakub,
The only people that could restore this is Azure/Microsoft. I'd recommend creating a ticket with Azure Support:
https://azure.microsoft.com/en-ca/support/create-ticket
For this specific case, you are going to want to get a support plan for the subscription that was affected.
While there's no guarantee of a solution, it's crucial to take action promptly to maximize the chance of data recovery. I'd recommend not losing any opportunity to retrieve the data before it's lost permanently.
If this is helpful please accept answer.