@Rozzak My first guess would have been "Insider trader", someone who trades on stocks using information not available to the general public. (Illegal in most places.)
But since she said "last century" I ducked about a little and found this which is think applies better https://www.investopedia.com/terms/i/inside-sales.asp
So basically "someone who cold calls/email you and tries to sell you stuff" (doesn't necessarily have to be cold calls).