Static IP DNS resolution issue

I've opened multiple tickets with support on this and they all seem to magically get closed with no resolution.  Whenever I call back in to find out what's going on, they can't figure it out and open a new ticket and it gets closed again.

Here's the issue.  I have a /29.  The reverse DNS resolution for my addresses resolve to xx-xx-xx-xx-static.hfc.comcastbusiness.net.

However, that hostname does not have a DNS record.  Here's an example:

$ host 50.242.1.1
1.1.242.50.in-addr.arpa domain name pointer 50-242-1-1-static.hfc.comcastbusiness.net.

$ host 50-242-1-1-static.hfc.comcastbusiness.net.
Host 50-242-1-1-static.hfc.comcastbusiness.net. not found: 3(NXDOMAIN)

I expect the forward resolution for xx-xx-xx-xx-static.hfc.comcastbusiness.net to actually resolve.  Is this too much to ask for?

I upgraded from 16/3 to 50/10 and during the process they lost my original /29 and had to assign me a new one.  My original /29 came from this ip address neighborhood:

$ host 173.8.117.1
1.117.8.173.in-addr.arpa domain name pointer 173-8-117-1-Minnesota.hfc.comcastbusiness.net.

$ host 173-8-117-1-Minnesota.hfc.comcastbusiness.net
173-8-117-1-Minnesota.hfc.comcastbusiness.net has address 173.8.117.1

Note how that works fine.

What can I get to get my current block to actually properly resolve?  I know the simple option is to request that I get cidr delegation set up or simply have the reverse resolve of my IP addresses to hostnames in my own domain (that properly forward resolve) but I would simply prefer the generic comcastbusiness.net reverse resolution.