Accused of being a ***** at Truworths Chatsworth

I paid my Truworths account at Chatsworth today after 2pm. The assistant Shreta took my account card & I swiped my FNB bank card. I left the store with my slip & did not read it. Truworths Chatsworth called me after 3pm to ask to come back to the store as another customers bank card was swiped to pay my account. I went home & came back to the store. The store manager, Kimberly had made an accusation that I swiped the other customers bank to pay my account in front of many instore customers. I defended my innocence since I am innocent & asked her to review the cameras before saying such a horrible comment. No one even apologized for inconveniening me instead made me seem like a ********. This is the first time something like this has happened to me. I cannot understand till now how another persons bank card was tapped when I tapped my own card????