Appraisal not done

Dear Sir / Madam, I have employed in private company since 18 months, my joining date in the company was 2nd May 2016.As per the company policy am not eligible for appraisal in the month of April 2017. A shortfall of 1 a month I have missed my appraisal .As per company policy, the same will be done after 1.6 months. Which has not been done timely, I have approached my immediate senior. He said, your performance is not good. Am confirm employee and company issue a confirmation letter on May 2017.My senior is abusing on floor with bad language in front of colleagues and the same was brought to my next level senior notice 10 days before the appraisal. With no reason, they said your performance is not good and we cannot give you an appraisal. Alone I cannot give my performance to the company. In the month of April all to my teammate and even my senior got their appraisal. Myself and my teammate (1 person is due for appraisal) , she got her appraisal .If my team is not performing, why the company has given appraisal to my senior and to my subordinates. Am having a family and kids , am only a person doing a job and no other source of income am having. Please help me and do the needful. 1) They have not communicate or given any letter to me in regards to my non performance 2) Can I approach legally on my company to get my appraisal and how. Want your kind advise and do the needful