Thanks for reaching out to us on our Comcast Business Support Forums, rprimrose!
I can help with getting that PTR set up for you. Please, send me a private message with your full name, address, last four of the account number and, the Static IP address and the domain you need it pointed to.
To send me a message, click my name then you'll be routed to my profile. From there, you'll see the option to send me a private message on the right side of the window.