(Hell, every so often various companies randomly decide that I and someone with almost the same full name as I are the same person, even without that person ever having had an account with the company, and then it's a pain to straighten it out because they all claim they have no insight into where those black box systems pull this information...yes, I'm really quite sure that I did not have a lease on this kind of car before I was born.)
Doubly so, I imagine, if you're not in the US, depending on whether you're an actual FTE or a contractor or what.
I find it hard to be sympathetic to the companies though, really - given how quickly the organizations that love to use family metaphors and imagery to describe their culture will drop people if it's inconvenient for the company, I don't think they get to cry foul on someone thinking they're entitled to the work as promised and nothing else.