Suspension Noise problems of the 2001 Lexus RX300

I took the vehicle to the Lexus dealer when purchase. I told the repair person that there was a noise/roaring coming from the front of the vehicle and I was told that it was the suspension not to worry about it. For this inspection I paid over $300. 00. Now the noise is back and it is much louder and it is constant. From 45mph and higher. The noise occurs when I am driving straight and when I turn to the right. When turning to the left the noise stops. I sound like the noise is coming from the steering column mechanism. The vehicle has been well maintained. Please note that this my complaint.