There are almost no qualifications required for fast food jobs. They screw up everybody's order! Hearing, Deaf, everybody. They get paid little, usually get treated like crap by their bosses and customers, and it really is a bottom of the barrel job so they don't care if they get fired or not. Plus, if they're making burgers a certain way all day their brains are on autopilot, they're not even thinking about what they're doing anymore so it's alot easier to screw it up. Go to their website and complain. Tell them that you already talked to the store's manager and they were rude and the same thing is still happening. At the very least you'll get coupons for free food. Have your family members email too. If they realize it's more than one person with a problem at a certain place they're alot more likely to do something about it.