Theft of my laptop in their parking lot

Yesterday 11th of November 2015 at about 11h30 am I parked my car in the shopping centre's parking lot to go to get my Medication from Dischem. Car guards where there directing cars in and out. When I came out of Dischem my laptop bag was stolen. How they opened my car I don't know as I was sure to have left the car locked. To make things worse the car guards where still there just 20 feet away from my car and they claim to have seen nothing. I was told the shopping centre cameras were not working and there is no footage I can get. This is a second incident I had this year in the same shopping centre. In July 2015 at 18h30 I went to gym at virgin active gym there and when I returned my spare wheel was pulled out and stolen. Again car guards were still there standing 50 feets away from my car and they claimed to have seen no one taking it and No footage was available I was told. I am certain this is not the shopping place to go to unless the security management removes those car guards as there are criminals amongst them (and there is no one pointing them out) and put proper security in place.