Burnt garlic roll, reported & got a rude response

I visited Spur at Ilanga Mall and was disappointed by the service received from the waiter Khanini and his Manager Solomon. In a nutshell, I ordered a garlic roll and it was burnt. When I complained about it I was given disrespectful responses as if I didn't know what I was talking about. I felt very humiliated. I would appreciate it if the staff concerned can be addressed about this unacceptable behaviour. I know that Spur wouldn't be affected by losing one customer but in my world '1 is one too many'