That's easy. Check this out: http://800notes.com/nb/search?q=victoria+martin
Victoria Martin is a fake name used by a debt scammer. These are low-life crooks who call and pretend to be a debt collector for some loan you forgot about. In that link you can read posts in greater detail about how the scam works. One key thing: A phone call or an e-mail is NOT legal notice of an unpaid debt. These callers are crooks!
Do NOT call back. That will just get you more of the calls. Ignore, block the number and don't pickup or call back suspicious names and numbers in your caller ID.
-- There is also a scammer who uses Steve Martin as a name. Scammers LOVE simple easy names. I think Steve Martin calls sometimes from India, and the accent screws up the con.