first thing I would do is go back and ask them to double check the balance, and ask them if the wheels are bent too.
my experience is that about half the time they mess up balance on at least one wheel. this is from a variety of places, dealers, firestone, goodyear, they all seem to put the junior mechanic on the job, and sometimes they get distracted, or just mess up.
you paid for a wheel balance, they should run true. (or the shop should tell you what is wrong)
Free advice is worth what you pay for it (sometimes)