Being called mthakathi

I was so offended by a white man who was doing a polygraph test on me when he called me mthakathi so many times after seeing my beads and goat skin on my hand,I was so angry tried correcting him I'm not mthakathi I'm a traditional healer but kept calling me mthakathi, already when I left there I knew I didn't get the job,I believe I didn't fail polygraph test cause I have never commited crime,I never ***** for a company,I never commited cause if the machine said I did then it's lying I'm innocent,so it is clear I didn't get the job cause I was called mthakathi, people are killed by being called that I'm thinking of taking this further,the lady I was with for interview was called start working today.