I think we should contact Network Solutions instead. (From newfold.com/abuse, instead of Web.com, pick NetworkSolutions.com)
Thanks, I hope this works.
Meanwhile we have a first win, as exch[.]center was taken down hooray! I just received this email:
Thank you for contacting us. Please note that the reported domain name has already been placed under ClientHold.
With this suspension, all associated services on the domain name cease to function.
Please note that the clientHold status will be maintained until the malicious content is removed from the website.
Do let us know if you have any queries.
Regards,
Abuse Mitigation Team
PublicDomainRegistry