Disappointed client

Hello Peter. I have been using Rain 5G router from last year August. At first I had challenges with their billing dates which I have managed to solve after speaking to lots of their consultants. I have since stopped paying in December because the network is just bad and for some reason I have been billed every month even though it is off. My understanding is that, "you pay as you use" but it seems it is not the case with me. I have recently received the email that their prices are going up meaning I will be paying for something that I am not utilizing. Please help.