You could try small claims court but don't know if you want to risk the filling fee of $25 to $50 depending on locality and don't know if you have to file in your jurisdiction or where they are located. This is of course up to you. I would certainly not do any more work for them. If they do have current jobs you could pretend to be interested in one sending an email that you want to do a job for them but won't until you get paid for your past work. This may get you paid then of course don't do the job but at least it may have got you paid. You could also try an old fashioned letter to the company. I am sure you could find their mailing address online.
Shopping Western NY, Northeast and Central PA, and parts of Ohio and West Virginia. Have car will travel anywhere if the monies right.