If someone without a license filed immigration paperwork for you and charged you for it (we call these individuals "notarios"), it is possible that the individual made misrepresentations on your behalf that you are unaware of. If you signed blank forms, you are responsible for what the person wrote. The greatest danger is that the notario filed something that caused you to be placed in removal proceedings without your knowledge and you now have an in absentia order for removal that you are unaware of.