How do you reach management/decision makers at companies that hide 'em?

It's well known by now that many companies have outsourced their entire support/customer service apparatus, allowing only live chat, email, and ticketing systems, while providing no phone support whatsoever - even for urgent matters. These overworked agents mainly parrot information from companies' knowledge base, while possessing little agency to make any kind of decision.

Perhaps you have spent hours or days going back and forth with a polite but clueless and disempowered agent about a matter that could be solved in 30 seconds by someone with decision-making authority.

My question: how do you track down management/decision-makers at these companies in order to escalate a problem and get an actual solution?

A current thorn in my side: Getaround.