Upgrading Disney+ and Hulu Bundle to Ad-Free Doesn't Work

I have the Disney+ Hulu bundle through Xfinity and have been trying for three days to upgrade with no success. 

I log into Xfinity.com or use the Xfinity App, go to Manage My Plan, select the Disney+ Hulu Bundle, select the "$9.00 Premium" option and click Next. 

The next page shows me my new expected bill and asks me to agree to the Terms of Service and then I click Next. 

It then shows me a page with a confirmation number telling me I'll receive an email within 2 hours, but it never comes. I've called Xfinity support and they could do nothing to change it. They told me to try in the Disney+ and Hulu apps, but both tell me my account is managed by Xfinity and direct me there. 

I have never had such a hard time giving a company more money. What can I do?