i get calls from them all day every day. they have the wrong address listed for my businses (my old address is actually now my competitor) but they refuse to update the listing. they say i have to call google to do that. when i have never ever authorized being listed anywhere by anyone. Its not a "free listing" because he tried to sell me a website for $200 repeatedly, called me dumb and stupid when i got aggressive with him, said that i have to call google to fix my address and that it'll take 5-6 months!! .. and then after i was done being rude as hell to him, he told me that i wasn't going to get any business. fun times.
Never pickup the phone unless you know who it is period. If everybody did that, we could put telemarketing out of business. wouldn't be worth their while.