Their month to month is now a ****

They're no longer month to month but didn't inform us and now I apparently owe them R2000 even though I haven't been using them AND my internet has been disabled. What do I owe them for then?

For context I've been using them since 2020 and they never used to charge for the months you weren't using and you could start using their service by paying again. The way they quietly changed this just to siphon more money from customers is very ****my.