Persistent calls

getting multiple calls and when i answer they hang up but when i don't they leave a message to call back at a different number about checks i wrote i don't have any checks

I keep getting calls from this number - they state it is LEGAL SERVICES calling for someone not me.  Refuses to believe its not me or that I don't know that person.  I asked to speak with a supervisor and was told they don't have one and then he hung up on me.  The call is originating from a phone in Reedley, CA.