I've asked a Comcast employee to help you. You should expect a reply in this thread.
I apologize for the experience you've had. I would like to help make this right. I cannot guarantee a sooner appointment but don't think it would hurt to see if anything is available. I'd also like to help get the credit applied to your account.
Please send me a private message by clicking on my name, "ComcastChe" then click private message me. In the body of this message please verify your first and last name, street address including city state and zip code, and the account number or phone number associated with your services.