What has happend to Comcast? Need PTR Resource Record configured in DNS

I have been an Xfinity customer for 7+ years. I have heard horror stories prior to becoming a customer; however, I have been pleasantly surprised with both performance and support. That is, until now. 

I live in the Chicagoland area and starting on around June 16 of 2022 my modem started acquiring a different Class A subnet, from 24.14... to 76.136...

Unfortunately, the newly acquired IP does not have PTR resource records in Comcast's DNS. This is causing customers, including myself, to be blocked from e-mail providers' SMTP servers because their servers check for an existing PTR record in DNS for the connecting IP address.  See https://datatracker.ietf.org/doc/html/rfc1912#section-2.1

This was working perfectly fine for me since I became a customer. I confirmed my previous IP did, and still does, have a PTR RR in DNS. I am not going to name names, but I was told by level 2 support that Comcast made platform changes and this DNS configuration step was missed. I was told multiple times by support, "No sweat, sir. No worries. We will fix this for you".

I have called support five times over the past three weeks, each time having to re-explain the issue, and each time having to have a new support case opened because of "policy". The last time I was told by Level 2 that the case was closed and they did not know why. I was told a supervisor would call me back within 24 hours. This was last Thursday and I have not heard from Comcast, again.

Can anyone here help? This seems insanely simple and I hate to leave Comcast over a lack of communication.