Rude stuff member and missing order

Yesterday, I purchased a Foldover and a burger. When I arrived at my workplace, I discovered that the Foldover was missing from my order. I immediately tried contacting the branch to report the mistake, but my calls were not answered. Due to the branch not being reachable, I had to return to the restaurant today at my own expense to resolve an issue caused by an error in my order. When I explained what happened, the staff member who assisted me was rude and dismissive. Instead of apologising and taking responsibility, I was told that I was to blame because I did not check my order before leaving. The staff member offered me a replacement meal, but I refused it because my concern was not only about receiving the missing item. My concern was the inconvenience, additional petrol costs, wasted time, and the unacceptable way I was treated when I reported a mistake made by the restaurant. I paid for a complete order and did not receive what I paid for. I should not have been made to feel blamed or dismissed for bringing this matter to your attention. I am requesting that this matter be properly investigated, including the conduct of the staff member involved. I would also like McDonald's to consider reimbur*****t for the reasonable petrol costs I incurred because I had to return to the branch to correct this error.