Steers wild coast Not honoring the menu advertised

@steerswildcoast clear bold advert states menu which allows you to swop sharing meals beef pattie for chicken or veg. Manager and cashier refused to honor this clear advert even though it was pointed out to them. This is against good consumer behavior. They have fallen foul of consumer protection laws. I called head office of steers to complain. This is ******** conduct and steers franchise here must be investigated.