Sounds like a pyramid scam.  They called and didn't leave a message.  I called the number back because when I Googled the number, it said it was for Roter Rooter in Torrence, Ca.  But when I called back, it was a recorded voice that called itself Dana that wanted to teach me how to earn a 6 figure income.  It asked that I leave my name and telephone number and some background info so "they" could figure out if I was a good fit for their program.