Dissatisfied Customer

On Saturday, 27 June 2015 at approximately 16:19 pm in Cotton On Gateway my two month old phone (Galaxy A3) worth R4500 was ****** out of my friends bag. I had a garment in my hand and my friend had a cap that we were going to purchase,during the time my friend went to the rack to change the cap for a different color the phone was taken out of her bag. When I had ask two managers directly after the incident to view video footage, they both took my number down and told me to come back Monday. I also reported the incident to Gateways head of security who told me there's nothing much they can do. On Sunday, 28 June 2015 I went to the police station to lay a charge on Cotton On where the police advised that I go to Cotton On first and see what action they going to take. By Monday, 29 June at 12:30 no phone call was received from Cotton On's management. I went to the store where the manager that had the authority to view video footage refused to show me the footage because according to him its against their policy to take customers into their office.Cotton on should be held reponsible because of witholding evidence and delaying me from tracking my phone.Please help me. Thank you!