If you take the stance that these calls are impacting the US infrastructure and falls under the Homeland Security umbrella, these robocall farms would be stopped with appropriate resources. Right now, violating DNC (the various lists) is not a criminal violation.
I get something to the order of 60-100 spam calls a day regarding medicare benefits (my number has somehow been associated with a retiree who shares my name). I fully support drone strikes on overseas call centers.
The people working in these call centers know what they're doing by defrauding the most vulnerable members of our society and should be considered enemy combatants if their host government is unwilling to act on their crimes.