Dear when I first drove it for few km I also was not expecting that noise, went to Toyota dealer and ask him to check, they checked and said it's tyre pattern noise drove some 4400 km but could not digest noise so today I've changed my tires with Yoko Advan db, Japan made, let's see if I get peace of mind.
If you've driven under 200 km, you may get good deal else will have to accept whatever they offer.