First year promotional rate ended, and Xfinity internet plan increased from $20 -> $59!

Without any warning, my Xfinity internet plan increased in cost from $20 to $59 a month! I tried chatting with the Xfinity Assistant bot, but it just told me "Your user role doesn't have access to manage this account's billing preferences."

I assume the cost went up because my initial one year promotional rate ended. Is there another promotional rate that I qualify for? I'm fine with having slower speed internet, but paying 3 times as much per month is not something that I budgeted for.