Burnt bun at McDonald’s

I made an online order and McDonald’s Springs, delivered a burnt bun for my daughters happy meal. Then got my order incorrect, the double cheese burger and the double Quarter pounder with cheese we exactly the same including the packaging. I requested them to reimburse me 20 October till this day I haven’t heard from them. I called their customer care on 29 October and still no call no email nothing from McDonald. This is how they treat their clients? They give them wrong orders, burnt food and ignore their complaints? Is this how this establishment is run?