I feel humiliated

I am very disappointed with the experience i had at Shoprite Khayelitsha CBD, Corner Water Sisulu and Nomamzo Mongo Street. that was the 06.05.2015, when my mum, my daughter and I went to the store. we went to do some groceries when it happened to see my daughters dad, we saw him when we was paying by the teller and it happens that my daughter ran to him he bought her a magnum almond he stating he was done paying he paid it separate so when we went out of the store the security stopped us to say he wants a slip for the magnum we didn't have the slip bcoz we didn't buy the magnum by the look of things out of all the things we had bought he only asked for the slip for magnum. he took us to the room we explained to the security how we had the magnum he went to the teller and she said no one paid for the magnum now everyone was looking at this coz they could see security is following us, we had to pay again for the magnum he didn't give the slip for the payment we have made he wanted to do a photocopy but there was a problem with photocopy machine so he took the slip and staple with other papers, I am very angry and feel humiliated. baby daddy gave me the slip which shows he paid.