Agreements apparently means nothing

In February this year a consultant of African bank came to my residence where i signed and agreement of an amount for three of my accounts . The first installment was due in April 2015. The debit orders for all three my account went of accordingly as of the 01st of April 2015. The debit orders ran through as planned from April untill July in August 2015 I noticed that my credit card installment was deducted in double the agreed amount but the two loans were deducted according to my initial agreement. I contacted Africanbank to request a refund to which they denied. I then called back and explained that I was never behind with my agreement and that they had no further arrangement with me to deduct any other amounts. The lady asked that I provide a copy of my signed document, I then supp**** a page with my total monthly installment agreement and had no other feedback since then. This was two days ago , I have email asking what the feedback was, but was only told that it was sent to the relevant department. In the meantime I have to wait for 4 months installments to be reversed as this money is due to another creditor.