Who called from 3237756550

Call and hang up about 6PM 7-30.  Called later and same thing.

This lady called agian, my wife answered this call. The lad ws talking about" save energy". We tol her don' call us.

Line is silent at other end.

I let all unidentified calls go to the answering machine.  They hung up.  
Why do we have a "Do Not Call" list if these telemarketers are allowed to call anyway?  
With no consequences, there is no reason for them to stop!

Multiple calls and hang ups without voice on line.