Incorrect Billing

How do you bill someone for a data they have not used, My router has been off and i was not using any data. Isn't this supposed to be a month-to-month Billing? Rain is operating like a contract now. I have been using rain since 2019 but lately im unhappy with rain service and incorrect billing. I'm even told that I am supposed to pay for November month for a data I've never used and if I don't pay, I will be billed for December too. I opted for Rain because of the month-to-month billing. I could have opted for a contract if I wanted one. I've been with Rain before and the month-to-month worked very well. Lately everything seems like a contract. I wouldn't recommend it to anyone, they should be clear that this is a contract. I am cancelling my subscription and i hope they won't bill me after my cancellation just like everyone whos complaining about being billed even after cancellation. How do you bill a client for a service that has not being rendered.