Political robo-call. It would not disconnect until it had finished its recording. I needed to make a call for work, but was unable to because, even though I hung up, the robo-call did not. My phone was useless until the recording finished. What if I had needed to call 911?
I can't stand calls like the one you have described. The fact that you cannot end a call is mind boggling. This is one of the reasons why I am glad that I do not answer calls from unfamiliar numbers.