Rain Billing is ****

I have been trying to cancel my Rain for the past year now. I didn't even know that you had to cancel a month-to-month contract, but here we are. I received a call from Rain saying that I owe R5050.00 because even though Rain, the internet provider, was not providing internet, they were still billing me for some reason. The call centre lady said that apparently Rain is a subscription, a subscription to what exactly? I told her that I requested a cancellation of my service on WhatsApp and online, and she said that they cannot cancel my account until I settle the payment. I asked her what I am paying for? She said, "It's a subscription". A subscription to what? I don't know. Rain just continued to bill my account while providing nothing, so even if I continued to pay R650 (assuming I want to continue with Rain, which I don't), they will not reconnect my internet because of these arrears that I must pay. So Rain wants me to pay for the past year of no service in order to continue with the service. This company clearly does not understand what a subscription model is. You can't invoice someone for something you have not provided, you can't pile on another baseless invoice on top of the last baseless invoice and claim that the person owes you for the previous month of nothing. I signed up for a month-to-month account. I will not pay for something I have not used. I will definitely not pay retrospectively for months and months of nothing. I must give Rain R5000 for what?? Somebody, please make it make sense because they are now harassing me via SMS, email and phone call.