But (as you see from my grudge revealed above), people resent being charged to talk to a live person. An alternative to charging is to make it difficult and inconvenient. By introducing sufficient friction into the process, corporate customer service systems can induce customers to either (a) use the often-clunky online resources that are available or (b) give up on whatever they were trying to do. Either way, that's money saved.
So, we see two things happening here. First, corporations are stratifying their customers by the value that they provide to the company. Second, they are deliberately introducing frictions for the less-valued subset of customers, in order to minimize service interactions with these individuals.