Cell C still takes debit orders on a prepaid accou

I was on a postpaid contract without a phone with cellc for a while. I cancelled my contract a month in advance as they required and it was converted to prepaid on the 27th of June. Since then I have bought R335 of airtime of which R185 was on the 20th of July. Today a debit order went off my account for R323.17. This unacceptable!!! They have taken more than the airtime used during the last month. This brings the question \how much did they take from me that was not used?". This is known as *****ING.<br> <br> I'm also not the first that this has happened to. A friend of has had a contract that was cancelled and another 3months were deducted while he was at Vodacom... Again... where did they get the values that they deducted?"""