Need to send a direct message

Evidently I need to post first before I have the option to send a direct message, so yay.  In case anyone is nosy, the issue is because I'm attempted to add unlimited internet data and am continually met with the

"Sorry, this line of business is not currently available due to a temporary error. Please try again shortly." message every single time no matter what avenue of approach I attempt.  Searching these forums suggested a direct message to Xfinity Support is the best method.  Frankly this has been a very obtuse and frustrating experience.