poor service and unfair treatment

I'm disappointed with cell c service, every time when there's a software update the sim card gets damaged and I have to pay over R100 to do a swim swop. I cannot do swop every month or every second month, I feel like cell c is making money out of this.

And when I phone call center to do a swim swop the say I failed security questions and they gonna block my number but at the end of the month they gonna deduct my money until the end of my contract term. This is so unfair. How can they treat they customers like this? it is not my fault that they sim cards get damaged because of the software update