Take it back and explain the problem. There can be some debris or rust that got caught between the rotor and hub or between the rotor and wheel. That will prevent those parts from sitting squarely against each other. Also, he should know to always use a torque wrench on the lug nuts. Power tools will over-tighten them and possibly cause the rotors to warp after they get hot from normal braking and you hit a puddle of water. The warping is due to the uneven clamping forces on it.
New rotors can be warped too. Any job involving brake or suspension parts gets a test drive and he should have noticed the vibration and diagnosed the cause. If that vibration wasn't there until a few weeks after the work was done, it is likely the new rotors were made in China. There's nothing wrong with the quality of the parts, but when we make parts out of cast iron, we let them sit and "age" for 90 days before they get the final machining. The Chinese cast 'em, pack 'em, and ship 'em, then they age on your car. Warping is very common. A light machining will take care of that. Some people demand new rotors, but those will just do the same thing in a few weeks.
Wednesday, September 3rd, 2014 AT 6:49 PM