just received a call ... didn't answer

call came in when I was gone.  called number back and it came back as "phone not in service" did reverse look up... out of Denver someplace.  no message left

The message says this is your card servce with a limited time offer for lower interest rates.  In other words, this is likely a credit card scam.  If the call-back is "phone not in service," could this be a spoofed number?

received a message on our answering machine leaving a classical music song with no words spoken.  This has been going on for about 15-20 years intermittedly.

I am reporting this number (303-212-3454) for violation of the NO CALL list!!  I have been on the list for yrs and yet these people still call.  Please cite them for calling my cell phone. They shouldn't be allowed to be calling anyone who are on the NO CALL list.  Isn't that what the list is for, that we wish to receive NO calls from telemarketers????