Grandfather Plan Scam by Xfinity leads to Data Charge

In February, I noticed that my bill was quite a bit higher than normal.  I have the auto-pay, or I would have caught this in January.  However, my bill went from $177 to $210, then $210 to $217, Then $217 to around $280, then to $320, and now to $352.  This is crazy.  The reason being cited is excessive data usage.  When I have had no additional activity or change in how we use data at home.  The same number of devices are hooked up for two people in the home. We don't play video games and primarily use the internet for TV and work.  However, I learned from the customer service agent in February that the plan I was on was no longer offered by Xfinity.  And to my surprise, I all of a sudden exceeded my unlimited data plan.  What???  I spoke with the first representative who said a credit was going to be issued for the overage and to pay the $215.  But no such credit was issued.  I called back three weeks later and spoke to another representative, who said they were going through the process of escalating the issue and obtaining approvals.  She placed on another plan that was going to be unlimited data for real this time and a five-year lock-in price.  Yet I received a $352 bill, and I was told a $200 credit would be issued within 12 hours to cover excessive charges for January and February.  No such credit was issued.  It is more than a month later, and a $13 late fee was charged to my account.  I made payment arrangements, waiting on the bill credit.  It is April 1, and no such credit has been issued.  In fact, the representative stated it would be resolved, and I would not have to call in again.  Yet, here we are, and I am waiting for another representative to call me back. I have a scheduled callback for 12 pm; it is 12:22 pm, and there is no callback. I have the written communication of promised credits from both conversation threads and confirmation emails.  I am so disappointed with how Xfinity has approached this, exploited my services, and refuses to correct it. I have been with this service provider for over ten years and I am going to transfer to a service that does not lie to its customers.  I am asking you all to honor the credit you promised on my account and remove any late fees.  I have not exceeded any data usage and believe it's a scam with your system. I will formally submit my complaint to the AGO in Washington State, along with my conversation and email confirmations, so they can inquire further on behalf of all customers, as this is not of integrity.  It's bad enough things are so expensive but to expolit consumers in this way feels excessively criminal.