They make mistake and I have to pay for it.

After Cell C made a mistake with our upgrades they corrected it and refunded our airtime which they took because of the contracts being wrongly upgraded. So the mistake was on their side and fair enough they refunded the airtime and fixed the mistake after we published the whole story on hello peter. Now they added that refunded airtime to our bill and wr must pay for it. Not sending me statements just sending an sms that I owe the R151 and if I dont pay they will switch off our phones. Not knowing why our account is suddenly in arrears we phoned them, and they explained that we now have to pay for the airtine that they refunded us with. I am so sick and tired of cell c every other month we have problems with them their services are pathetic and I will never do an upgrade again when the time comes I will cancel all my contracts with cell c.