I called Xfinity a couple weeks ago about upgrading my internet plan to unlimited due to going over 1.2TB every month but they said I had to turn in a modem/router we had in possession so I did and It was delivered to Xfinity by UPS. I now go to the website to add the unlimited plan to my account but this error appears "

Temporarily unavailable

The product you’re interested in isn’t available for purchase at this time." I would like to know why I can't add the unlimited data plan to my account now.

Edit: After trying to get unlimited data through messaging Xfinity Support through the forums app another error appeared, I would get sent an email to upgrade my plan and get stuck on the billing page. I would click next and it greyed out when moving to the review page. I will go onto the next step of going to a store or contacting support from the phone number.

Edit #2 After going through the same process on the phone and the same error occuring there was a verbal acceptance way to accept the changes so if you have this problem call by phone and ask for verbal acceptance. I don't know if the website will be fixed or what is causing my account to not work but maybe in the future someone will figure that out.