annoying calls

okay. i am one of the lucky few who managed to leave college with no student loans. however, we've been receiving about 5 calls a day with solicitations to consolidate/better-finance/whatever my supposed student loans. it drives me crazy that they ask for me by my first name, like they're someone i know or someone i'm expecting a call from. we've added our phone number to the do-not-call registrar, but unfortunately, it takes about 6 months for the our number to be officially added to the list. what i don't understand is how do these people obtain my information, even if it's incorrect, anyway? it's frustrating that we've taken to screening calls which i've always found annoying when people do it (it's one thing if i'm not available to take ANY calls at all and another to answer one and not another; i find it rude and disrespectful to the other party). i hate telemarketers. i hope i never have to be so desperate for work as to be one of these participants of life's irritants.