price increase in the middle of contract?

I am checking my current statement at xfinity.com, and notice it says the following: "Effective with your next billing statement on or after January 1, 2024, we estimate the monthly price of your services will increase by $6.00." I am in a two-year contract with xfinity with a promotional price. I have not changed any of my services. This price increase does not make sense. Please check, and let me know what exactly this price increase is for.