They served me stale food

I went to Wimpy Sandton this morning for breakfast. The food I was served had a bad smell and was stale. Asking why it was like that I was told the food was ok but thats not what I was tasting. I ate a bit of the food and could taste it was off, I just paid the bill and left. Now I have a running tummy since this morning I am going to have to leave work early because of that. I am so disappointed as you would not expect such from a Sandton store. The managertook my contacts and said he would call me. From 8:30 am till now I havent heard from him.