Edgars Fashion / Edcon review: gun held by suspected employee 5

17 April 2015, my little sister and I were shopping at Edgars (Eastagate). Whilst shopping around Edgars two employees of the Edgars' store approached my sister and I. The two employees were dressed in similar attire as the rest of the other Edgars' staff (this includes a name badge). The employees persisted to assist me in particular as I was looking for an outfit, as I had an important event on the 19th of April 2015.
Between the two employees I was able to recall the one employees name "Thandi" as it was visible. The other employees tag was not visible.
I had trusted these two employees as they appeared to be working in the store, they knew the various brands and cashiers.
Whilst shopping around Edgars with the assistance of "Thandi. I kept my little sister within my visual field. To my surprise the unnamed employee physically garbed my sister pulled her outside the store and pointed a gun at her demanding for my handbag.
Security reacted in a slow manner. Security began to assist me after 20 minutes (Am sure the suspects had left).
I am shocked, surprised and confused, how can this happen at Edgars. The floor managers didn't even notice that they had "two unknown employees."
The security is extremely poor. A police case has been opened however I would like to express disappointment towards the reaction time of the security, the quality of the CCTV cameras and the fact that anyone can pose as an Edgars employee with ease.
As this incidence happened at Edgars(indicating poor security control) I would like further assistance and cooperation from Edgars.
My handbag contained by passport (which is the most valuable item to me) I require my passport.