Can't change plan on the xfinity website with flex
I have been unable to change my plan ever since I added flex. Each time I go to change plan, it takes me to an error page that says
"Looks like you'll need some extra help completing your order. Thanks for getting started! Since Flex is in your plan, the Xfinity Assistant can help complete your order online. Or, you can call 1-800-XFINITY."
It has been like this for the past 6 months. I called customer service 4 months ago, and they said someone should email me with a resolution, but I have not gotten any emails so far. Is there any other way to resolve this issue?