Just block them....if you have an iphone go to the list of recent callers.....you will see an i to the right of the number....click on that and scroll down.....you will see "block contact"....click on this and they will not be able to call you again....
This call came in on my cell phone. No message. Have received other calls from this number. No message. It's very inconvenient for me as a senior citizen with mobility problems to have to get up and find my cell phone which is ringing. I only use it in emergencies when out. I do not give the number out to anyone except family and some physicians so when it rings I think it must be important. My house phone gets enough of these types of calls and I'm on the DO NO CALL Registry.