Unless you have patience the size of Jupiter, I doubt you’d want to spend countless hours watching Youtube videos and asking people on Reddit to figure out how to fix something that is very dangerous to fix yourself.
Fixing garage doors isn’t easy. Sure, you’ll pay a couple hundred bucks for a guy to tell you how to solve your problem, but if you’re not very experienced, you could risk your life and leave your garage worse off than before. Not good.
Most large companies aren’t coming at you with their best. They’re sending relatively inexperienced technicians that could end up ruining your door further. They also don’t arrive on time, don’t do the repair job as quickly and efficiently as possible, and don’t accommodate you.