When you answer and there is a delay, you know it is a computer generated call so just hang up. It is hard to imagine that these people actually make any money doing this.
1. You must have a caller ID
2. Never answer any call that has an ID you don't recognize - let them leave a message
3. This is now under your control
4. You determine if you should return a call
5. Do this every time and your frustration will be minimized
Please do not get angry if you feel this is stupid. Only trying to help.
I have recorded, on a spread sheet, all unsolicited calls for 1 year because my little Panasonic would only block 29 calls. Since, I have bought a call blocker. Today was the first time I have received a call from this number . It left a message that seemed to last 30 minutes (kidding) but it was a long one, CTY. It wanted to give me government assistance.