I don't know about other countries, but in Canada telemarketing is a real nuisance. Especially those 'blank calls' that are counting how many people pick up!
I got this information from people actually in the telemarketing business. If you're outside Canada I don't know if they work but it's worth a try.
If you tell a telemarketer to take you off their list they are
required by law to do that.
If you say 'no' three times they are required to stop trying to sell things/get your opinion.
Therefore the best way to do it is pick up, say no three times, tell them to take you off their list, and hang up. I've been doing this for quite a while and I get almost no junk calls anymore. Except those blank calls. They still annoy me.
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