Spoken from the pretty obvious position of never having to have worked a low-wage people facing job.
Here's the real situation: the people that pick up the phone when you call them up aren't going to be paid much above minimum wage at all. They have zero institutional power to fix anything. You're yelling at people that, themselves, almost certainly are only barely making enough money to get by either.
It is worthless to yell at these people because they can't fix shit; they don't set policies, they have no power to fix things and all your yelling is going to achieve is at best counterproductive to what you want to get done (since now the front facing employee dislikes you personally and is less inclined to try and help you out) and at worst is going to get you into further trouble when you do need something routine done. (Since now you're on the list of "people that the employees don't want to put any extra effort into since they're jerks".)
There are people that get paid to be the complaints facing entity of the organization, who are paid to withstand whatever shit you can throw at them and who have an ability to fix up whatever you needed in specific. They're not the people that pick up the phone.
What you need to do is channel the inner Karen and ask to speak to the manager. The manager can help you with this sort of thing, they are the ones that can do shit to avoid sustaining the machine, because they have a career they want to grow into and risk actual consequences for pissing people off.
Be polite (but firm; you don't need to be walked over) to the first tier support employees, even if they can't help you. Save the complaints for the manager (who you shouldn't be afraid to ask to speak to either). The managers job is to deal with the real complaints, not the routine stuff that just happens to need a human involved. They are taking a job to be the face of the machine for reasons other than "I literally need a minimum wage job to survive".