File for a C&D and then, if that does not help, a court-issued injunction order ("Abmahnung" followed by "Antrag auf Erlass einer einstweiligen Verfügung"), if you're German. This works somewhat reasonable for Twitter, Facebook and Google.
https://turkishlawblog.com/read/article/221/algorithms-meet-...
I look forward to this getting used against Google and everyone else banning customers without explanation and/or recourse.