Best way to get foreign ISPs to shut down DDoS reflectors?

Thu Apr 23 21:14:59 UTC 2020

Is there a guide on how to get foreign ISPs to shut down reflectors used in
DDoS attacks?

I've tried sending emails listed under abuse contacts for their regional
registries. Either there is none listed, the email is full, email does not
exist, or they do not reply. Same results when sending to whatever other
email they have listed.

Example Networks:

CLARO S.A.
Telefonica
China Telecom
Korea Telecom
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