Sent a text message saying only OMG.
Bad enough I have a blocked number list 2 feet long from these scum telemarketers and collecting agency's looking for somebody or anybody with my name. But now they are texting too?
I blocked em. Added to the list. Don't answer any calls from unknown numbers who leave no message. These are known as jump calls. If you answer you wind up on new and bigger lists that they sell to telemarketers.