Unable to use cell c and have to pay

Firstly my 200gb data expired in 2020 I used 50 g because I was unable to use there data . It's just not working . I can not use there data but I must pay for it .

Secondly they charge me now more the agreed amount . I have to pay for my contract in december R380 and then R500 in january because I'm paying for December.

Paying double for December.

But I can not use there data .

So why am I paying for someting that can not work and I am unable to use . I will now be opening a icasa case .