Service outage for 16 days. Offered a 27 dollar bill credit

I have been on the phone with customer service for the last two days trying to get this issue resolved with no avail. My service had been out for a total of 16 days due to issues on Comcasts end they admitted during a call. It has seemingly been resolved with restored albeit spotty service at the service address. I called to make sure I was not getting billed for the days I had no service and the max they offered me was a credit of 27 dollars which is unacceptable. I have submitted multiple credit escalation tickets and they get closed with no resolution. How do I get my issue escalated to someone that can help.