Mcdonalds fast food

I went to McDonald's Malvern drive thru on the 9th August 2024 around 14:22 and ordered 2 Chilli cheese nazo meals when I collected my order I went to work and at break time I opened the burger wrapping then took a bite and noticed it didn't have a burger patty inside, I then emailed them telling them of what they did wrong on the 10th August 2024 they called me with an apology and a burger patty I mean what the f must I do with the patty only