Long long time ago, I had a similar issue that could not get resolved through normal escalation means.  

I ended up going on linked in and grabbing every executive and senior email contact I could find and notified them.

Issue resolved in one day. Nothing gets a nocc moving fast like execs asking about random network issues.

This company was nowhere near the size of Ticketmaster though.

Regards,

--

From: Ryan Hamel <administrator@rkhtech.org>
Reply-To: "ryan@rkhtech.org" <ryan@rkhtech.org>
Date: Wednesday, November 30, 2022 at 11:29 AM
To: 'James Dexter' <james@althea.systems>, "nanog@nanog.org" <nanog@nanog.org>
Subject: RE: Sites blocking ISP Addresses

Based on experience, all I can say is good luck. They do not respond to anyone.

Ryan

From: NANOG <nanog-bounces+ryan=rkhtech.org@nanog.org> On Behalf Of James Dexter
Sent: Tuesday, November 29, 2022 8:43 AM
To: nanog@nanog.org
Subject: Sites blocking ISP Addresses

Dear list,

We have address ranges that are being blocked by sites like Ticketmaster. Customer support is able to assist, and unable to receive a response from legal or hostmaster emails. What are the recommendations for requesting a removal from the blocked list at these sites?