Westgate Mall Roodepoort

My husband and I came to the mall to buy food mind you it is cold outside so we just put on our gowns, as we were approaching the shop we wanted to buy food from, the two security officials came to us a lady and a guy and they told us we not allowed in the mall with pajamas *** we just came to buy food and since when is that a rule there is no signs stating this rule, not even on the website so I want to know why were told to turn around, I am very disappointed and don't appreciate this we also tried calling management but whoever answered the phone could not hear anything apparently, I will be putting out a post everywhere on social media regarding this everywhere until we get answers.