An NBA scam is threatening to disconnect thousands of Queensland households from the Internet, with one woman being harassed over the phone eight times in the past three days.

The ABC has been told scam calls include an automated voice, warning the NBN could be turned off in the local area so maintenance can be undertaken.

The NBN Co Chief Security officer, Darren Kane, said any scams should be reported to the Australian Competition and Consumer Commission via its Scamwatch Website.