Thanks to those who reached out off list.  Managed to get this resolved. On 2022-06-26 08:42, Christopher Munz-Michielin wrote:

Hey nanog,

Does anyone have a good contact for Quadranet's abuse department? They are announcing one of our prefixes and it's been a week after emailing their abuse@ email address and creating a ticket but no movement calls to their support line have been less then helpful as well.

Replies on list or off list are fine.

Thanks!