That really depends on the type of call center we're talking about.
Many (most?) call centers won't do much more than telling you to turn it off and on again, even when you're talking to a real person. (And for many cutomers, that is really all they need.)
And AI operators in those call centers wouldn't even need to be better than humans, just cheaper. Not just for saving on human hiring: no building rent, no insurance, no this and that; everything would live within a cluster somewhere.