Security Contact for PlusServer.de (AS8972)

Hi all, Sorry for the noise, but I am looking for a contact for PlusServer.de (AS8972) to get a security issue resolved. Email to their abuse@ address has gone unanswered for nearly 24 hours at this point and the malicious traffic has not been stopped yet. Hopefully someone here has a security or noc contact that can I can reach out to. Thank you, Tim