Vodacom Customer Service Complaint

Three months ago, the date on which I receieved my salary changed. I called Vodacom and requested that the date of my debit order be changed. I was assured that the transaction had been successful. Another month passed and the debit order was taken off on the incorrect date and I incurred charges from my bank. I visited a Vodacom shop and they assisted me in requesting that the money be returned to me as the debit order should not have gone off when it did. I then received an sms stating that as a kind gesture, Vodacom would be reimbursing me just over half of the amount deducted from my account. I am still awaiting the refund of the full amount. I called Vodacom again to query why the debit order had gone off on the incorrect date, I was informed that the date of my debit order had in fact been changed. This evening I received notification that the debit order had again gone off on the 25th, instead of on the first of the month. The telephonic avenue of communications has proven to be ineffective in resolving this issue and most likely had an adverse effect on my credit rating. I am deeply saddened that this issue has failed to be addressed and rectified by Vodacom. I hope that this issue will be promptly resolved by Vodacom in order to restore my belief in their customer service and reputation.