“At least a person (and their employer) wants to get you off the phone; the person because they're sick of being yelled at and coming up with reasons not to escalate, and their employer because they're paying for the time spent.”

Click. Disconnect. Easy. They just disconnect the call when a customer is frustrating them and oftentimes disconnects happen when first reaching a person after sitting on hold for a long time. The other tactic is to transfer the customer around the call center into oblivion.