The usual nonsense! Phone rings, I answer, no response then they hang up.
Not sure what difference this will make but for what it is worth there it is.
  I called the number back and it was CAA reminding us to renew our membership. Which is already done. So no harm no foul.;o)

didn't pick up unknown call.  Which telemarketer is it?  This number called my phone on 3 separate occasions.