Early Debit Order

I have a loan account with Capitec Bank and my FNB account is debited the 27th of every month. I got paid my bonus the 15th of this month at which point Capitec decided to debit me early instead of the 27th as per norm. I called on the 15th to query this and have the debit reversed and was told to fax through proof that it was my bonus paid along with the ref. number on the document (ref ***8) in order to have the money reversed. I then faxed the document and called back later in the day and was transferred to the 'collections' department who apparently had to do the reversal but as I was transferred the call got cut. i called again the 16th and was told it can't be done as the collections dept. is closed on a public holiday. I called back today (17th) and was told by the collections team they can't do it it must be done by the client care dept. I was then told by Vinolia in the collections dept. she will call me back in 15 min as she needs to get her team leader to reverse the debit but no call back received. My point is that it does not matter when money enters my account my debit order should remain the 27th and I would like the debit order reversed asap.