my plan has been automatically changed from $25/m with 400mb to $84 with 200mb

my previous package was $25/m with the speed of 400mb/s. Now I found my plan has been changed to a $84/m one and with a $10 services I had never not subscribed (xumo stream). I did not receive any notice and now this is the lowest fee I have to pay if I still want to use the Xfinity internet plan. I remember last year the customer service guy told me that the fee will be elevated to $35 or $40, which is a significant gap compared with the current "deal"