Treated like a Theif

I went to Woolworths in Mall of Africa on the 28th of June 2019 to buy water and cupcakes, paid at till 2 and told the teller i wont be needing the receipt she didnt have a problem with that. As i was walking out of the store one security gards stopped me and requested a prof of purchase from me told her i didnt have one left it at the till point (didnt know woolworths requested proof of purchase when walking out their doors) the security gard then asked me to stand aside cause all she knows i could have ****** the items at had. She then called the contol office to let them know that shes standing with a suspect with no proof of purchase and asked them to trace my steps (told them i paid at teller 2) on the cctv after standing there for a whole 10 - 15 min looking like a ***** the control office told her they couldnt see me anywhere. The sercurity then told me we need to go back to the teller and find out where my proof of purchase was, i was escorted down stairs by the security gard to the till point with everyone looking at me like im some ***** who stole water and cupcakes , the teller confirmed that i paid for my items. All the security gard said to me at that point was i should never leave my slip at the till ever again with an attitude not even an apology. Im really disappointed at the treatment i recieved at woolworths mall of Africa im even sceptical of buying anything there ever again cause of being treated like a *****.