Terrible service ever from a MANAGER!!!

Went to Cresta mall this afternoon to exchange a face cream that was purchased last week by my mother course she brought the wrong thing and just wanted the right thing nothing more since the item was brought by account,I explained to the manager there who's name is Gugu that my mother is blind and can't walk for a long distance well @Jabulani Mall they don't have the particular item that I'm looking for since it's the closest store that my mother could go to,but I decided to take the prove of purchase so that I can get the right item from Cresta since I work close to the mall but what this woman said to me I couldn't understand telling me that I should come with my mother there to exchange but if it was clothes she was gonna exchange it for me,what I don't understand is that why couldn't she just exchange the item course I have the prove of purchase...she made me feel as if I stole the damn thing,I'm sure that if it was a person of another race she would have given her what she wanted,I'm very disappointed and angry that I wasted my time to go all the way there and not get what I went there to get!!!I've never gotten any good service from the staff of foschini ever since and I'm sure as hell will never go buy there again!!!I just want this nonsense sorted out ASAP