they left no name but keep calling.

A very rude lady by the name of Tracy Wallace left me a voicemail on my cell phone and work number.  When I called her back, she was completely belligerent, cursed at me and hung up on me.  When I asked her to give me the company name that she is calling from, she stated, " I don't have to give you that information".  Well, how am I supposed to pay a debt if I don't even know the company name??????? She called me multiple times during the day and advised me that she will keep calling me until the debt is paid.  By the way, she is trying to collect on a debt from 2007 from a pay day loan she said I had.  I never had a payday loan in 2007.  This is an absolute hoax and I will be filing the appropriate paperwork to complain about her and her collection efforts which are not in compliance with the Fair Credit Debit Act.