Hungry Jack's Australia

I went to the halal hungry jacks on Somerton Rd and ordered a sausage and egg muffin with a mocha in a meal. The muffin I received has no sausage in it, has to rounds of egg is poorly constructed and smells of bacon. It also has a dark sauce in it which looks like someone put something else on the muffin and then took it off. I am Muslim and it's unacceptable that there has been any sort of cross contamination, I don't eat bacon but I know what it smells like and they've clearly put it on there then taken it off when they realised that wasn't my order. I took one bite before I realised the 'sauce' was inside and threw it in the bin.