How can I either talk to a person about my bill or cancel my mobile plan?

Reach back out, how? Couldn’t get anyone to answer or call, and no one contacted me after I scheduled a callback. Went to my local Xfinity store, where they said they have to call the same numbers and even they can’t get anyone on the phone. 

user_1fuh6m Excellent question, what we wanted to know is if you had been in contact with anyone to address your billing/mobile related concerns since we last spoke. It sounds like that is not the case just yet, but luckily you are connected with our Xfinity Forums team which is the best in the business at finding the resolutions you need. Let's get a direct message going to get a better understanding of what is going on. Please include your full name and complete service address as well.

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