Ongoing Issues with Mobile Billing

I had an issue with Xfinity Mobile - signed up for a mobile phone under false pretences.  After spending 4 hours with various forms of communication, I finally got a call back from a rep, who apologized and said he would make it like it never happened and would credit everything I was charged.  Big surprise - no credit and today, another $24 charge.  The rep I spoke today said the credit would come in 30 days.  Come on, people.

Where is the customer service?