accused of being a lier by my credit provider

On the 20th of Nov 2015 I made a call to truworths to make the arrangements for my payment expected on the 25 Nov, because I was moving to another city so I needed money to pay for the move, the lady I spoke to told me that I will have to make for the month lost in three months and I agreed and she also told me to ignore the smses that I will get regarding the payment. Today I got a call from them asking for my payment, when I told them that I had made arrangements kagiso the agent who called imp**** that I was lying because had I made arrangements the system would actually show, I was insulted because I know what I did. I'm very on their service, I worry a lot about my credit record hence to make the arrangements. Why would the lady say that she made arrangements when she knows that she didn't, I have lost trust and interest on truworths.