THere are many ways to balance tires, and weights do get knocked off from time to time. Heck they could have had a scuffed rim, replaced it with one in the service center, and didnt realize it was out of balance.
We had a brand new F150 that was in the shop 3 times within the first month for a battery drain issue. Should I return that truck as well, or just get the service center to fix it correctly...... We have humans involved in the manufacturing process which means things happen that will need to be...