discount refused

I bought items worth R7059.50 (R2559.60 @ 13:04 and R4499.9 @14:50) asked for the discount and she refused. On the same day I bought other items at light spot for R2163.57 (@13:45) and got discount served by my black brother. Did she refuse me discount because I am black and I think about returning items bought from the lighting warehouse and getting them from Light spot centurion .