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Dealing with other interns

i have a huge problem today. 

Some other interns decided to push their works to me because they were assigned "too much" work from the director Pretty much they decided to boss me around when they are interns like me except they are a few years older.. I have already stated I already have work from before and declined nicely in front of the director. The next day, they still decided to message me in the group chat and be sarcastic about me having "nothing to do". Pretty much gang up on me. 

How do you deal with people like this in your work place?