Cell c is *****ing airtime from customers

I'm so furious with cellc, I took out a contract a couple of months back! It's a top contract so I normally top up! I bought 100 rand airtime four times and they chowed it and was given a lame excuse that it's my internet! This never happened while using telkom ! I'm very furious and wish to cancel my contract! My number is ********** 638! Cellc is a *****! Tired of this bull****! I want my money back! And want to terminate my contract! I cant go on like thie for 24 month!