McDonald’s complaint: Customer service

I ordered a McMuffin and coffee (at McDonalds Balby) through the app as part of the promotion they were running; ordered at 10.45am from home and made payment with my card. When I got there at 11.15am they told me that they wouldn’t honour it as it was past 11 (the app specifically said you could order up to 11). I was disappointed and asked if I could at least have the coffee portion of my order as a goodwill gesture but the manager was rude and had no customer service skills whatsoever. I’ve owned a fast food franchise myself in the past and know how important customer service is to keep customers, and how negative social media comments will drive business away. To top it off I wrote to the McDonalds complaints email address and despite getting a standard email back that my complaint would be looked into, I have heard nothing since.