I suggest you take it back to the shop that the car got the work done and tell them to fix it. There should be no wobbling with the pulley whatsoever. The mechanic probably misaligned and/or did not torque the bolt down enough. As for reusing the bolt, as long as it still in good condition, it should be good to reuse, however, since you are bringing back to the shop, have them replace with new one. And double check their work again prior to driving off.