Attempting to add Unlimited Data gives "Temporarily Unavailable" Error
I'm going to the http://xfinity.com/buy/plan/checkout/XFINUDAT link that's included in the "Can I Get Unlimited Data?" article, and it gives an error that the product I'm interested in is temporarily unavailable. (xFi Complete has hardware comitments I'm not ready to make)
Other posts have suggested getting in contact with the XFinity chat, so I tried the 'Chat with XFinity' option to use the automated XFinity Asssistant with no luck, and I'm not seeing any other chat options.
Some older posts have suggested directly messaging Comcast Representatives, but most of those are followed up with comments from others that it's not the right way to get ahold of them and was causing an unnecesary backlog.
I'm looking for any other suggestions on how I can go about getting Unlimited Data added now.