Old oil causes sickness

I ordered flapjacks at Wimpy at Campus Square yesterday Tuesday 7 June.When the order arrived I ate and tasted that the flapjacks was made in old/used oil. I returned the flapjacks but felt sick. As i returned home I had to stop at a garage because I got sick. Today I am in bed with nausea and upset stomach and I will spare the gory details.

I know oil is expensive at the moment but this is not ok.I am happy to pay a premium for clean oil but I am not prepared to pay doctors bills and miss work because of negligence.I am so disappointed in this brand I grew up with.