A Whangarei woman forked out $2000 for 15 minutes of garden work after she felt intimidated by a group of men.
And while the actions of the group are not illegal, police are warning the public to deal with reputable companies and, if they feel threatened, to contact officers immediately.
It comes just as Northpower announced it was concerned at reports of people posing as Northpower arborists and seeking payment immediately which echoed concerns from Top Energy earlier this month.
Northpower spokesman Graham Dawson said its arborists did not cold call or ask for money for tree trimming.
"We send letters to land owners ahead of time, provide written quotes as to the likely cost of the work required.