Most likely the rep just gave you a courtesy credit. An actual credit for 4 hours of service interruptions would be something like $1.
I would like to look into this for you from here. To protect the privacy of your account, can you provide your full name, street address including city, state, and zip code (and apartment number if one is associated), and the full account number or phone number associated with your services. To send a private message click on my name, then click private message me.