Cannot view or pay first bill to start service

I ordered Xfinity Internet on Aug 3rd, and the modem/router came on the 7th. I went to set it up with the app, and realized it needed me to pay the first bill (which I was not charged at checkout) in order to set it up, but if I try to view the bill, it just says its unavailable/didn't load properly and to check back later. Same thing on the mobile and desktop website. If I click "Pay Now" or try to look at my saved payment methods, it just says "Restricted Section" and the only option given is to go back.

So I checked back everyday and check the mail everyday (despite signing up for paperless billing) to see if either something would change OR I'd get a piece of mail with the bill, and thus far, nothing.

I also checked to make sure my order was confirmed and included internet and it does indeed, I have the email confirmation and my account on the site and app confirm Im supposed to have the 400mbps plan.

I'm not exactly sure what I'm supposed to do, I literally cannot do anything to fix this from here? Please help, I need actual internet and not just my phone data!