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              ‘Meta is out of options’: EU regulators reject its privacy fee for Facebook and Instagram
 
            
            (finance.yahoo.com)
          
          This is a most excellent place for technology news and articles.
You should search for something like "data protection office" in Czech language, they likely have tips on how to lodge a complaint.
edit: should be a good website: https://uoou.gov.cz/en/consultation/contact