Credit - promotion expired

I called in April and added TV service back to my Comcast account with the promise of a great price for Comcast TV plus the Hulu bundle (for free) 

The representative was unable to add the bundle, so had me sign up for the bundle and credit back that service with the promise it would be resolved and added. I called back in May and was unsuccessful again and was told it would be escalated to tier 2. In June I called back a third time and was told that this promotion expired in May and there was no way to put it back on. I asked for a credit and was promised to call back from a supervisor. I called back again this past Tuesday and today spent well over an hour on each call waiting for a supervisor. Tonight I finally got a supervisor but they were unwilling to help me. I am asking for 12.99 x 12. A full month of Hulu as that’s what I was promised. My monthly bill is well over $200. I’m not even asking for a full month of service. I’m merely asking for what I was promised. The supervisor told me that he would not give me a credit for the service as it was never added. my response to that is correct. If it was added, I wouldn’t be looking for a credit. At this point, I’m ready to disconnect my service all over again. I have never called for a credit. And I would never have called for a credit had what I’ve been promised been added in the first place.