Treatment of clients

The treatment of customers upon suspicion of theft needs to be reviewed. I walked in with a product I had purchased the week before. Walking out, the machine starts ringing and I am asked to stand aside. Upon investigation, after explaining my side of the story that this product was purchased last week and I don’t know why their machine did not ring on my way in . I was called a **** and a *****. The managers were called, they went to the back to investigate something and returned saying the stock is balanced and I can go. What about my humiliation in the public and not even an apology. I understand the assumption but after an accusation like that in public I would have at least appreciated an apology.