POOR SECURITY SYSTEM & MONITORING OF CLUB CARD USE

I was at clicks at EASTGATE MALL JOHANNESBURG, where on the 25th of March 2015 I purchased a hand cream with other toiletries, so when I got to the till the cashier told me I had points which were converted into cash& ended up paying just the excess, I used both my club card &my own bank card for this purchase. As I was leaving the store the scanner at the exit went off &the security guard checked my till slip& everything was accounted for then I left the store. on the 2nd April 2015 I went to clicks again to purchase some items again as I was leaving the store the scanner went off only to find out it was the hand lotion again after my hand bag was searched in front of the other customers, and I was questioned by the exit I told the security what had happened previously but he did not listen, I told some guy I had purchased the lotion in the store then I was taken to their office only to find out there was no record of me purchasing anything yet my bank statement reflects the initial purchase, I tried calling customer service all day Tuesday &I was not helped with my complaint , I went back to the store still I have not received any correspondence like the supervisor ensured me