Please help

Good day I'm experiencing something unusual I have a store account with Woolworths and I decided to settle my account and close it I went to the store on the 15th of January 2021 and made a cash payment of R1070.00 at Germiston. I keep on receiving calls from them telling me that I've reversed the money how is that possible if I made a cash payment in store? They told me the matter is under investigation but everyday they call me and tell me I should pay this is so frustrating matter not yet resolved