Job interview

I went for a job in Akash jwellers when they said that vacancy is available during interview they asked me everything i replied but the most annoying thing they asked is what caste does u belong to i replied then they said we will call After 2 days i called back to them then they said no vacancy is available... This means they have judged me due to my caste and being a sindhi they have judged a sindhi very shamefull way of taking an interview they just want local staff their luck.