Unfriendly toward coloured people

My continued experience with the Engen in Gardens Cape Town is always poor It seems coloured customers don’t get greeted by any of the internal shop staff, I just had an experience with a supervisor and lady on the till (coloured and black respectively) I wasn’t greeted and my initial contact with these people were very off putting, it’s not the first time having an issue with this Engen, Management was very condescending to me when I complained before this I won’t even bother, see only the white people get welcomed it’s a friendly good Morning etc I will never go back there as I’m not the right colour it seems