Rain Internet Service Provider! ********!

I had a rain sim card, the one where you pay R250 month to month and then you get access to internet. I stopped using the sim card in May and since then I have been getting messages that I owe rain, the total amount owned is now R750. Like R750? How did we get here Rain? I thought I paid for what I used, now since I'm no longer using the sim card, why do I owe you such a heavy amount? You are ******** me, the lady I spoke to on the phone said that the money goes up whether I use the sim or not, well... I did not sign up for that! Why didn't you inform me on the changes or rather suspend your services? So, now I owe you for the changes that were implemented by you without my knowledge?! 6Le dikeleme!😡😡😡😡😡😡