Nimble groups

I have account on Woolworths store I make arrangements to pay R100 every month last year then on January 2025 I went to vaalmall in Woolworths store to make a payment so when I arrive there the cashier punch my Id and says that there is nothing appearing on the screen Which means they handed over my account to Nimble group while I was paying each and every month so now I am not happy at all I tried to contact Nimble group to send them proof of payment but still there is no solution at all they told me that my last payment it was on 30 august 2024 which is not true I loose hope because I was almost there by paying my account but I am back to square one it's like I did not pay at all.