These are not "telemarketers" calling. They are SCAMMERS and CRIMINALS intent on obtaining your personal info so they can steal your identity, or your credit card # so they can run the card up to the credit limit on personal purchases, or contributions to phony charities, etc.
Typical robo-dial/scammer call pattern - land line rings, caller ID shows "V31709213700531”, obvious spoof, do not answer, no message left = SCAMMER = BLOCKED.
Have seen this same "V31....." caller ID format numerous time wth different numbers all from 609 area code. Also several robo-dial calls showing "Allentown NJ" and using the 609 area code. Keep blocking them, and they keep changing the number.