It's just a temporary line. The installer should have put in an order to get the line buried, it typically takes around 10 business days, sometimes a little longer. It can't be buried until the utilities are marked. You don't need an appointment to get the line buried and you don't need to be there.
I've asked a Comcast employee to help you. You should expect a reply in this thread.
PS: There is no such thing as Cat 6e
We don't want to lose you as a customer. I'd like to apologize for the inconvenience you've had and help make it right. Can you please verify your first and last name, full street address, and the phone number or account number associated with your services in a private message?
To send a private message click on my name "ComcastChe", then click private message me.