The best course of action to take with the scammer calls is to find out what telephone service they use and report Fraud/Abuse to them directly. It can be found online usually.
The Do Not Call Registry is a fraud and a waste of taxpayer's money. If they actually DID anything to stop these calls to the public there would be a decrease in them, NOT AN INCREASE!!
Received this call today....Caller ID said "Card Services" and "This is the last time we are going to contact you before we close our file on your account"