If a telemarketing company "cold calls", there's a chance it got your number from the phone book. But there are a host of other sources.

Marketing companies trawl through public registers - such as the local council's list of building consents - looking for personal information to help their sales pitch. Many companies, and even some government agencies, sell personal details to telemarketers.

Anytime you enter a competition, fill out a warranty card or subscribe to a magazine, the company will probably add you to its marketing database. It may on-sell your details (Consumer NZ doesn't).

If you're a TrustPower customer and you pay your bill on time, you'll automatically become a TrustPower "Friend". One reader told us how TrustPower telemarketers cold-called and tried to convince her to switch her toll account from TelstraClear to ihug. TrustPower says customers are given the option about whether they want to receive marketing information when they first join up.

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