Over Charged

I have 2 contracts on my name one is for my mother. It was about 2 / 3 months after my mother upgraded we got a account form them where we both signed up for a top up contract so you pay a set price for an x amount of airtime data and sms's. We went to see them and all they told us was that head office is in strike and we need to pay the money or our phones will be cut, We ended up fighting crying but just had to pay. about 4 months later we had to pay a mount of R2000 for something we still don't know. But just to get them off our back we did it. Now I got a account again and I just wont pay it. They say I must go and see them and I just wont because all they tell me is \Sorry we don't know just pay..."Hope you will be able to help us in this matter. I don't see any other way out. Will really appreciate any help.<br> <br> Kind regards<br> Liza van Rooyen<br> ***"""