Consumer NZ is launching a nationwide campaign to fight back against dodgy door-to-door sellers.

It follows continuing serious complaints about door-to-door sellers.

Chief executive Sue Chetwin says they've dealt with cases involving elderly people sold three thousand dollar vacuum cleaners that clean no better than vacuums you can buy for a hundred dollars.

They've also dealt with complaints from consumers pressured to buy grossly overpriced beds and other household goods they couldn't afford.