Deformation of character

On the 24th of October 2015, I contacted the prestige banking department at about mid day, to query on my revolving credit. I had a telephonic conversation with a consultant where upon wanted to pay my balance on my revolving credit to obtain the amount available. Only to find out that my revolving credit had been blocked by standard bank credit department. I enquired as to why it was blocked, only to my astonishment to find out that according to the consultant I missed a payment. I explained to him that I could not miss a payment as the bank has a debit order on my cheque account on the 1st of every month. He then advised me to go into a branch for assistance which I did. I Spoke to a consultant at East rand mall , she then checked on my profile and unfortunately she could not assist me at all. She asked me to contact standard bank credit department on Monday. I then contacted them as she asked and explained to them that a debit order went off my cheque account on the 1st of July and the 31st of July 2015. According to them I owe money and yet I was never one payment short in 10 years. I was never notified about the arrears, and I need this matter to be resolved asap.