Expired food and bad service delivery

I bought a milk tart by Fournos in Rosebank on Friday 2015-12-04 during lunch time and when I got to work realised that it was off unfortunately the receipt was lost already , I retuned it the same day after work when I got there I spoke to Jane who is a white lady and she made it very clear that she doesn't believe a black person returning a thing without a receipt she claimed that I was lying and the whole argument was not polite at all , told her that she was being disrespectful and unfair though she gave me back the money but the treatment was so horrible.