Rude unsympathetic manager

Really disappointed with McDonald's Hillfox level of poor customer service. On Fri 3Aug I bought 2meals n nuggets, one for which was for my pregnant wife (foldover) . When I got home we realized that the foldover was not put in the packet. Because I was already home I could not go back to the store immediately. We tried calling the number on the slip to our dismay it was always busy n we couldn't get through. Sunday morning we tried again and the phone was still not going through. Today in the morning I went to the restaurant to lodge a complaint and to my biggest shock the store manager showed no empathy and was not willing to help and seemed very much uninterested. He kept on saying he had the phone on him the whole time, so with that statement I don't know if he's implying that I never called, he did not even care of how things could have transpired. This is very disappointing because I'm the customer that is being inconvenienced in all of this. The mistake is understandable, we are all human and we make mistakes. But the audecity of a whole store manager to not care about his customers is what buffles me. I hope this can be dealt with in a much better manner than what that rude guy said he would do.