2008 BMW X5 noisy tires

Tires were making a bouncy noise at around 20 mph and beyond. I had my car's wheel laser aligned and balance (per BMW claim) due to bouncy noise. They said they did the service outlined. My tires also rotated. Result. It got worst. After a week from the service date, I invited one of their tech guy to ride with me and has said that the tires, due to the rotation and because it was wearing out unbalance, the noise is normal and that the only way to eliminate the noise is by changing my tires. My tires are still look good. Now, it vibrates when I break. I am kinda hesitant to bring it back to the dealership. Is it possibly true that such bad tires can cause this such noise and vibration when breaking? I am very tempted to go to an independent service center to have my wheels checked and align as needed.