Q: Front Wheel Bearings on 2002 Buick Century

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My dad recently had front wheel bearings put in. He had the diagnostic test done It came up front wheel bearings. The same noise continues to happen. The mechanic told him it was a defective part. They put a new one in but it still keeps making the noise. Can you please help It would be appreciated for your help. Dad's on a fixed income and can't afford to be shelling out $1000 already.
(1) Answer
Ok here we go again. No details. What is the noise, does it get worse when turning, does it get louder with increased speed, on the left or right, both sides, hit the brakes and noise changes, etc.? We cannot read minds. We cannot see the vehicle. A little help here. Can you describe the "diagnostic test done?"