Minister defends 'polite' debt letters from Centrelink
Welfare recipients are tweeting criticism of the system under the hashtag #notmydebt.
Labor's spokeswoman on human services Linda Burney has called for the system to be suspended.
"Get it right before threatening people - not that hard," Ms Burney tweeted.
She said no MPs who checked the emails to their electorate office could possibly say the system was working.
