Calls like that sort of creep me out. I don't know if they think they are returning a call and you should know them or whatever, but once it is clear they have the wrong number shouldn't they apologize?

The only wrong numbers that don't faze me anymore are to the local pizza place (its number is one digit different than mine so I get them all the time). And even then, I tell them they have the wrong number and *give* them the correct one. Amazingly, rarely does someone either apologize or thank me.