Xfinity live chat agent fraud via app

I messaged with a live chat agent via the app about my monthly bill being higher than normal. They said it was due to inactive and unreturned equipment on the account that had a fee associated with it. I asked for it to be remove and my bill adjusted back to the original monthly amount. The agent said they would do that and sent me an order number and the chat ended there. I checked back the next day to make sure the changes went into effect only to find that my next upcoming bill increased significantly and it was due to the live chat agent signing me up for a much more expensive plan. I was surprised since we never spoke about it via chat and I never authorized any new plan in any form. I have since been on the phone with customer support for about 15-20 hours total trying to get my old plan reinstated and the fraudulent activity reversed. So far I have only been told that I can accept a new similar offer if the computer happens to generate the same price and speed that I had, but the new contract is already in affect and can not be reversed. The security team said the only way to prevent this is to have a lock on my whole account which requires me to call the security team directly every time I have to make any change to my account and have a supervisor question why I am removing it and then I can make updates. The response to this fraud committed by an employee of the company has been lackluster at best. Usually glossed over and agents hoping it will be fixed by just offering me a new contract without any acknowledgement of the fraud, the lack of trust it caused, lots of hours spent on hold. Many days of promised call backs from different departments or supervisors only to be met with silence or additional holds with disconnects due to the call timing out in the system. I have spent  an insane amount of time to try and rectify an issue that exists within the Xfinity/comcast company yet only negatively impacts the customer.