Unfair billing practice

I have been using RAIN for my home internet connection for a few years. I was unable to pay on 1 April 2025 and my services were disconnected. Today as I logged into the website to check my account in attempts to pay and reconnect, I realise that I have a bill of R1731. They have been charging me R569 for 3 months while my services have been disconnected. I phoned today to query this and they told me that they still charge even during disconection. I then told them that I know that I have no contract and they told me that it is in the terms and conditions. I have asked to se a copy of the terms and conditions that I signed and the lady dropped the call. I want to make a pyment and reconnect but will not be paying for 2 months of disconnection.