BILLING DEPARTMENT HAS MESSED UP PAYMENTS AGAIN

In November I got a rude sms stating that I had not paid my Mobile account - I called their billing department and told the lady that I don't usually pay my account as it is via debit order and she said they tried to submit a debit order and it was rejected however I told her catagorically that this is untrue as it would have appeared on my bank statement and I verified it with the bank - no debit order was submitted. She told me that I could pay an EFT payment and she gave me the reference number. <br> The same happened the following month so again I called the billing department and spoke to a guy who said that they were experiencing problems with their magtape payments and that I could again make a manual payment which I did and I then asked if I could continue to do so as I did not want problems with this account and he confirm I could use the same reference number - now on 3t December I again made a payment and Telkom Mobile took off a debit order as well so now I have made two payments for this month.<br> I cannot afford for two payments to go off my account and I need to know how to get my double payment reversed and what the situation is regarding the debit order in the future