Always.
Parasites is right. Setting aside the absolute scammers, who deserves their own little corner of hell when they die, telemarketing is grotesquely intrusive and an incredibly sleazy way to sell a product. Especially when you consider that so many telemarketing calls are from large companies (Bell, Rogers, etc). For a while I kept getting calls from Reliance, who provide my water heater, trying to sell me insurance or upgrades for my furnace. That I don't have. Because I live in a condo! And they have my number because it's in my customer file. And then there are the insurance calls from the bank.
Thank goodness for the call display, that's all I'm saying.
Too bad we couldn't dig a pit and dump all those scammers into it.