Do I sue a business or business owner for illegal use of logo?

Question Details: This summer I entered into a business with a long time. My name did not go on the business licenses. However I have text and email that I am assumed attorney-in-fact. I was given bank and credit card information for the business to procure vendors and place orders. I also designed the logo and for the overseas manufacturer to produce our hair product with the logo that I designed. After 9 weeks of getting the company up and running, I received an email from my proposed partner that my services were no longer needed. I agreed originally that I would work for a nominal fee until the business was up and running. I was given partial payment but when it was time for the final payment to be sent, no payment was ever made. Also, the only reason that I agreed to use of my logo design was that I promised future endeavors with this company. I was told I was a partner, which is why I helped in the first place. The business continues to use my logo and branding without payment of my intellectual property. Do I have a case against the business? It is an LLC with one owner. I am trying to keep it short and just give a synapses of what happened, I can provide further detailed information.

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