how and in what manner can I pursue somebody for falsified threats, depicted to have come from myself, in regards to harassment charges placed on me?

Me and another individual had got into text arguments, after they had attempted damaging my car. Upon these arguments they told me to stop texting them. After they requested that I stop, I received calls from multiple individuals, threatening my life and requesting money. I returned derogatory messages, although none were threatening. They then decided to manufacture threats on my behalf, and display these to law enforcement, in which law enforcement filed reports, and charges were placed on me. I am currently going to be accepting a plea deal in order to clear aggravated harassment in the 2nd, on the basis that I accept harassment in the 2nd. The judge stating in court, that she wants to "slam me in jail", has caused enough fear in me, in order to accept a plea, out of fear of the judge's bias of said situation. These charges originated and were "substantiated", on the basis of manufactured threats, depicted to have come from myself.