That would not be frivolous or vexatious, I don't think. It's a judgment call. Of course, a person to whom a company said, “This is frivolous or vexatious because you've asked this information 50 times before in the last six months and we have no further information”, could go to the Privacy Commissioner. The Privacy Commissioner must investigate, has a legal obligation. But also there's a provision in paragraph 13(2)(d) that she doesn't have to prepare a report if she determines that it's frivolous and vexatious.
On December 4th, 2006. See this statement in context.