"we are reaching out publicly in the hope of getting the attention of the right people at AT&T."
Reminds me of the early noughties where we had AOL filtering their customers outbound emails, Plusnet putting daily data caps on P2P transfers using Junipers*, and NTL who filtered out any traffic from their customers, if it originated from a device with Linksys’s MAC address range.
“The Right People™” were the ones that had made the decision to do that very thing.
*or it could have been Ellacoya. The memory of the visit to Sheffield on one of their “Meet the staff” days is fading now.