I used to work in a call centre. It was fine, the pay was quite good for the amount of effort/stress involved, most of the customers were fine. It was OK.
Sometimes customers ringing in would be really apologetic, not just for taking up your time but like, apologising that you have to do something as awful as working in a call centre to make a living. Always found that immensely patronising. Like, I’m not an exploited minimum wage 0 hours worker here, I’m a trained professional earning not that much less than the national median salary for a fairly low-stress job.