Thank you for visiting the forums!
I've asked a Comcast employee to help you. You should expect a reply in this thread.
Thank you for your reply, our serviceability team will confirm if your address is serviceable and if a pant extension is needed. To avoid duplicating work and since you are already working with our Twitter team, please reach back out to them if you have any additional questions and they will gladly help.
I understand how this can be frustrating. Reach out once you are able to get the address verified and registered with your local USPS and I can help get this process started again to see if there are any changes.