Hello. About your escalation request, this is a public Microsoft community forum where Independent Advisors and other contributors are users just like you. We don't have access to Bing's internal systems, support tickets, or the ability to escalate cases directly.
Since you've already opened two tickets and replies to the support email are bouncing, I recommend contacting Bing Webmaster Support through its official support channel:
https://www.bing.com/webmasters/help/webmaster-support-24ab5ebf
Use the "Raise support request" option and reference both existing ticket numbers, explaining that the provided reply address is rejecting your emails.