Bank One harrasment, bad customer service, Nationwhide

First: Write them a letter, don't be polite, and tell them that they have the wrong person, these phone calls are harassing and demand, don't ask, DEMAND that they stop.

Second: File a complaint with the local phone company. Local phone companies have varying policies on whether to call the phone company or the police first. Other phone companies may require you to file a formal complaint with local law enforcement before they will deal with the matter. To find out what your phone company's policy is, contact the business office and ask for assistance.

Third: Go to your police department and file a harassment complaint against the bank. Name the local branch manager along with the CEO of the bank.

Fourth: file a complaint with your state banking commission.

If this doesn't get thier attention your only other step is to sue them. I would try small claims court. For Alabama, the limit is $3000.
(http://www.consumeraffairs.com/consumerism/small_al.html)

If that doesnt work, you need to hire a lawyer and go after them.