Victimized at Truworths Eastgate

I was shopping at Truworths Eastgate mall for an item that I saw online but was out of stock. This item I wanted to buy for one of my friends. So I took a photo of the item (keep in mind, this item is online to be seen) whilst I was taking the photo one of the staff members, came to me and said that I am not allowed to take any photos of the clothing, I explained that it was for a friend, but he persisted that no photos are allowed. There where no visible signs stating that no photos are allowed. After the man spoke to me. I felt very humiliated, as the staff was watching me after the incident as I was walking around the shop, most probably because they thought I was going to take more photos, I felt like a ********. I have never had an experience like this before as I am a regular shopper at Truworths.