I'm reminded of https://xkcd.com/810/
It is far better when call length is not a KPI. I would never go back.
IMO, if call length is a KPI, it's a key indicator that the company isn't willing to hire enough agents and is trying to apply pressure to shorten calls for purposes of coverage.
If someone could get away with it at a 911 call center, it could happen anywhere... and might happen oftener than we think.
[1] - https://www.sfgate.com/news/article/911-dispatcher-sentenced...
Of course some people would just say the issue was solved, falsely (which, you know, it was a little easier to get caught so it was higher-risk, in addition to being probably less moral), and there was also the X factor of how much you liked the customer, considering the extreme amount of verbal abuse the job entailed.
In general its, simply a bad idea to be rude to the person you expect to provide assistance.