Cellc bad service in accounts

My debit went off 1 Sept. I call in on 6 Sept to change debit date to the 10 Sept.The operator does not inform me There WILL BE A DEBIT AGAIN IN THE SAME MONTH ON THE 10TH OF SEPT. I paid for Sept the debit was for Okt. The system does not work that way.......no one informed me even after I said this is for Okt,yes Oktober. Then a debit goes off ...no funds obviously. This month they charge me extra R70 for the debit I was not aware off hoing off!!!How is this my fault? Their accounts are a mess,wrong amounts !!!! They send it out that way. They even say on my credit report with experien I have 2 accounts,but when I contact them it is only 1 reflecting but on my credit it shows 2. Stay away from cellc not worth the stress and frustration.