Go into a confrontation... Bullies are often bullies because they are afraid themselves. If you show them that you're not afraid of them... they will be afraid of you instead...
Don't let anybody push you down! If they try, the price should be so high that they never do it again.
If you show to them that you are not affected, in the long run, they will stop bullying you. Dont quit and find another company. As long as you're doing your job right, the bullies dont matter. If you show to them that you dont care on whatever they say or do, they will stop bothering you.