For me the worst is you talk to someone at a company, be it phone or support chat, and it becomes clear the person wants to help but the policies of the company prevent their customer support people from doing anything meaningful. The support person has no power, may not even be employed by the company in question, etc.

Then you get the salt in the wound customer satisfaction survey of "Did X resolve your issue today?", "Was X polite to you?", etc. If you score the person low you can cost them the job. If you score the high, the company celebrates high customer satisfaction.

You almost never see the question "Did the company put our support person in a position to help you successfully?"

The most blatant offender I ran into recently was Verizon has made a number of things like updating your autopay method app/website only. You can call Verizon customer support and talk to a human and all they can do is tell you they literally cannot take your credit card and you need the app. Because someone at Verizon decided their humans can take one time payments but not update autopay.