Contract Sim

I've had the most terrible service with cell c. I used them for over 2 years for a contract Sim card that was apparently discounted. I used to pay R150 for 10gb data for day and 10gb for night. My contract came to an end and they started debiting more money which was understandable because the discount came to an end. But now the bill in getting high every month. Like ***?! When I call in to ask they run around the bush and give me stories that don't even make sense. Initially they would call you when the contract comes to an end, just when you're due for an upgrade but this time around they didn't bother to call and one of the agents told me just how I didn't read through the termz and conditions and that it's my responsibility to call and ask for an upgrade. I'll never ever take up a contract with them. My cancelation keeps getting moved to ff months. I don't know what's taking them so much to just cancel the thing and stop debiting me ridiculous amount. From R150 I'm now paying R366. I'll never recommend cell c to anyone.