Since 2015, the Federal Communications Commission has ordered violators of the Telephone Consumer Protection Act, a law governing telemarketing and robodialing, to pay $208.4 million. That sum includes so-called forfeiture orders in cases involving robocalling, Do Not Call Registry and telephone solicitation violations.

So far, the government has collected $6,790 of that amount, according to records obtained by The Wall Street Journal through a Freedom of Information Act request.

The total amount of money secured by the Federal Trade Commission through court judgments in cases involving civil penalties for robocalls or National Do Not Call Registry-related violations, plus the sum requested for consumer redress in fraud-related cases, is $1.5 billion since 2004. It has collected $121 million of that total, said Ian Barlow, coordinator of the agency's Do Not Call program, or about 8%. The agency operates the National Do Not Call Registry and regulates telemarketing.

"That number stands on its own. We're proud of it; we think our enforcement program is pretty strong," Mr. Barlow said.