same thing happen with me. He garbled his name and then asked if I could here him. I said no, repeat yourself. After a couple of unsuccessful attempts to get him clearly id himself i hung up.
I did not answer but I know that this was a robocall because my anti-robo software kicked in after one ring. [Between my call-blocking feature from Verizon (allows me to block up to 100 specific numbers) and my free anti-robo call feature that I installed, I get fewer unwanted calls now. More peace and quiet.]