These discourteous folks ring my phone 2-3 times a day with a robocall from some thug demanding that I stay on the line because it's important that they talk to me, and important that I wait for them. They don't have the nuts to identify themselves or leave a callback number.
Whatever they're selling -- I don't want it. I've blocked the number they use, but they just cycle to the next outbound CLLI.
Obviously it's a call center, so these folks are obnoxious intentionally. I think I'll divert future calls to a new special greeting..