Hang-up, no message

Caller ID said "Service Dept".  I did not answer and there was no voice mail.

4th call from this number in an hour; I didn't pick of any of them.  Seems tonight (sunday) is annoyance/scam call night as I received same type of calls from other numbers too . . . I guess to the Do Not Call Registry is worthless.

Just because the numbers are different, don't assume the caller is.  Calling from multiple numbers which may appear to be scattered across the country is a favorite trick, especially among collection agencies ("legitimate" and illegitimate).  

While you might not answer a call from Nevada, where you don't know anyone, you might be quick to grab the phone when a call comes from Wisconsin where your Mom is living.  

Or you might just wonder what the heck all these calls are, and answer one to find out.

I'm betting you only have one caller.

Another Call.  Caller ID stated service call..  Auto message stated someone called from my phone requesting information to assist with morgage issues.  Since I am the only person at this number, this was a complete lie.  
Add to the fact my phone is on the do not call list.
Frustrating.