Customer service is an expectation that has changed massively over the last 5 decades and technology is a big influence in how well companies perform AND what customers expect.
My first experiences of customer service involved talking to a person at the counter at the local corner shop. I pointed to what I wanted, knew what the price was and handed over the money. We all smiled and I walked away with a bag of lollies. Things are different these days but customer service is more complex and more important.