Where can I talk to a real person?

I need to talk a real person about the way my plan and billing have been mismanaged. I used the chat feature twice and after the AI gave me the run around, I was able to talk to a live agent. Despite assuring me that they put in the request to change my plan so that I would have a 24 month promotion, they failed to change it. Then, I called in and after dealing with the AI for another hour, they were unable to help me and denied that the promotion I asked for existed. I have transcripts from the chat conversation ensuring that I am eligible and signed up for the promotion.

So how can I email a real person and show them these transcripts?