I've asked a Comcast employee to help you. You should expect a reply in this thread.
Slaxton, thanks for reaching out. I'd like to improve on this experience.
If you would like to dispute your internet usage and the charges following that, you must reach out to our customer security assurance team so they can begin an investigation. Their number is 1-877-807-6581.
Let's take a look at those equipment charges. If the equipment was returned and you are still being billed for it, we will need to work on removing the equipment before any credit can be applied.
Please send me a private message with your full name, address, and phone number so I can take a look at your account.