Breach of Contract - File Formal Complaint

I signed 2 of my restaurants up for the same promotional plan on September 10, 2024. All my locations are on auto payment so I don't really look at them very often, A reminder popped up on my calendar yesterday that my promotion was coming to an end and when I went to look at my bill I saw that Comcast has been cheating me on one of my locations this whole time. My bundle discount was supposed to be $109.00 for the first 12 months and then $99 for the second 12 months, but I was only given the $109 for September, October, and November. Starting in December of 2024 until December of 2025 I was only given a discount of $79.00. After that the discount went away. That's a total of $1,458. In addition, in January of 2025 I stopped receiving the $10 autopay discount although I still receive it on my other accounts. That adds another $150. I also stopped receiving the $19.95 voice credit as stated in my contract in January of this year for another $159.60. I called yesterday and was told by your rep. that I didn't have a contract despite my having it open on my computer. I have the docusign with the order number, the Comcast sales representative, and the Comcast sales manager dated 9/10/2024. You can also see the drop in my bill from September to October of 2024 before it goes back up. The rep told me to call a loyalty line which I did today. After telling me that my contract didn't exist, that rep told me the most they can give me is 3 months credit and tried to sell me an Ipad. No, the least you can give me is all the money owed to me under our signed contract before I file a complaint with the FCC. I need an email for the Executive Escalations team to forward my signed contract to and please don't tell me to go chat with your AI bot.