Early & double debit

I have made an arrangement to pay R950 per month on my personal loan. I made it clear that Nedbank must only debit on the last day of the month. There was money deposited in my account on the 27th January 2015, Nedbank decided to debit my account earlier before the agreed date. To make things worse they debited double (R1900). I do not have a problem with them debiting the agreed R950 but fail to understand why they decided to debit twice<br> <br> I want Nedbank to reverse my R950.If they continue debiting twice I will have no choice but to even stop paying them the agreed R950.I need to pay my other accounts and it is now difficult since my money is with them<br> <br> I request them to only debit my bank account on the last day of the month and not anytime decided by them or when money is deposited or transferred into my account<br> <br> If this is not attended today, I will have no other option but to go to the bank and reverse the whole R1900 and stop paying them<br> <br> I am disappointed in Nedbank<br> <br>