I find it very strange that they keep calling our business number.  What good is the do not call list?  We are on both state and federal do not call lists but keep getting all of these time wasting calls.

>>> I find it very strange that they keep calling our business number.  What good is the do not call list?  <<<

I don't know about your state's list, but the federal list does not apply to business numbers.  Your state's list may not, either.

From http://www.fcc.gov/guides/unwanted-telephone-marketing-calls :
"The national Do-Not-Call list protects home voice or personal wireless phone numbers only. While you may be able to register a business number, your registration will not make telephone solicitations to that number unlawful."

called but left no message

Just received a call from this number on my cell phone.  Did not answer and no message left.

Once i see the number i generally do not answer. But then i wonder if its important.

Tells you how bad economy is when people resort to this.