Hello and thank you for entrusting me to assist you. I am very sorry to hear about what is going on. Unfortunately, though, none of what you describe suggests that you would have any legal claims against your employer.
In general, no law requires employers to be fair to their employees. The general rule is that employment is "at will" absent an express agreement to the contrary. At will employment can be terminated for any reason not amounting to discrimination on the basis of a legally protected trait (race, religion, gender, etc.) or retaliation for engaging in certain forms of legally protected conduct (filing a wage claim, taking FMLA leave, etc.). It doesn't matter whether the basis for termination is fair, reasonable or even true.
So, all you can really do is attempt to reason with your employer and highlight your excellent performance. Your employer should have every reason in the world to keep you and reward you for the excellent results you are achieving. Doing so is in their own self interest. But again, since no law requires employers to be fair, no law requires your employer to do these things, and your only options are to persuade or to look for another job where you are treated better.
I hope that you find this information helpful and am genuinely sorry if it is not what you were hoping to hear. Please do not hesitate to let me know if you have any questions or concerns regarding the above and I will be more than happy to assist you further.
If you do not require any further assistance, please be so kind as to provide a positive rating of my service so that I may receive credit for assisting you. Very best wishes moving forward.