Double Debit Order

I contacted Vodacom on 3d March to notify them that no debit order had been done (service request reference number is S3-GPV39-9OWSK). I received an automated voicemail on 7 March informing me that my account was in arrears and that I needed to log onto MyVodacom to reissue a debit order. I did this as per the instructions in the voicemail. 2 debit orders were then issued i.e.: 8 March - R1143,61 AND 11 March - R1143,61. I then contacted Vodacom AGAIN and asked them to remedy (S3-GP621-124Z5). This was done on 14 March 2016. I have received no feedback, no apologies and Vodacom have effectively still ****** money from me as they have not reversed the debit order. The second debit order could have easily failed due to insufficient funds - leaving me with a bank charge that I would not have been responsible for. I have no idea what is going on with the billings department and am extremely disappointed with the lack of concern. I notice how quick Vodacom was to debit my account twice but don't seem to be inclined to pay back what they owe. Also Note: I have been a customer since 2007 and my account has ALWAYS been debited without fail.