Bad service and bad attitude

I have a complaint. Yesterday evening I purchased chicken leg quarters at Spar Manaba. When I want to cook it, is was completely rotten and stink. I took the chicken back this evening, but i did not keep the slip. (I did not expect to take it back). I did speak to the Manager on Duty. Lerato was on her name tag, she refuse to refund or exchange it without a slip. I ask her to give me back the chicken that I paid for so that I can take it to the Department of Health at Ug municipality to test it in the lab. She had one he'll of a attitude. I ask for the owners number, she and it was also refused. Clearly she is in the wrong position to deal with customers.