Every 4 years the Commission is willing to hear from individuals as to whether the GDPR is working. If you’re an individual, you likely got no justice from the Belgian DPA. Now you can report the DPA.

That link goes to a PDF which contains a link to another PDF which is a questionaire that can be emailed to the Commission. The email address they give is not on a Google or MS server, thus apparently usable.

Note that the questionaire mentions a deadline of 18 November 2023, but that was for feedback from select groups. The deadline for the general public is 8 Feb.