Love this site - I have an iPhone, and if you jailbreak it (Google if you don't know what that means - you need to do it!), there's a program in Cydia called iBlacklist, which lets you BLOCK callers (you can choose what happens when a certain number calls, such as: Voicemail, Busy Signal, Accept and Hangup, No Action [which does nothing], and Accept), and it also has a White List (which is very useful for parents, since you can setup the phone to only allow calls to and from pre-defined numbers.)
I create blacklists in iBlacklist, and put these numbers in - no unwanted calls EVER ring on my phone (OK, well, sometimes one will pop up that I don't have, which is why I end up here, find out who it is, and add them to the proper blacklist.) Bada bing, they always get a busy signal when they call me. :D
Of course, from now one I'm giving them my Google Voice number, which is WAY better; Google Voice forwards to my "real" number, so it's transparent to the caller, but the BEST feature of Google Voice is that when someone calls, I can go into the settings and BLOCK that person/number - if they call again, they'll get a recording saying "This number is no longer in service." For everyone else, it works fine. Plus, when I answer a Google Voice call, I just press 4, and it RECORDS THE CALL FOR ME.
Google Voice works with *any* phone, not just an iPhone. Check it out - you won't be disappointed. Plus you can pick your phone number (and have it spell what you want, if it's available! Mine spells something dirty. LOL)
They call, and call, and call. Never leave a voice mail. It is Bank of america card services. If you answer they will seek a payment if you tell them you have nothing to give them at the time they willl keep calling you, over and over untill you get your account up to date.
There must be a law on how much these people can call you. I run a business just to foot the bill and these people compramise it by tieing up my line all day, I will be seeking advice on legal action against Bank of America should these calls continue. they have been calling me for months!!
They are with Bank of America if you don't want them calling your office line then log on to your account online and update your phone numbers to something that is more approprite. Like a home line that has no voicemail.