Injustice in fnf settlement

Hi, Please guide me on below queries 1) After working for 2 months i resigned from a private company job clearly giving the resignation and was ready to serve the notice period(which was 5 days for non confirmed employees)Since the HR Portal was not working I could not mark my attendance online but signatured the manual attendance register in the office.It happened for three days in the due salary cycle. As the email system was not working i reminded by boss many times to approve my attendance regularization requests in the system. On the last day of my working he said that he has approved my attendance regularisation requests. In my FnF settlement these three days salary was not there and on the contrary my boss stated to HR that i was not present and I signatured the register in wrong way as fraud. 2) when I entered my resignation in HR portal and was ready to serve the notice period he asked me not to come to the office in three days. Inspite of his statement i asked him that it is necessary for me to come still my boss didnt agree. Since he was my boss i could not go against him. Again here also he befooled me and stated to HR that i was absconding. Please guide me how could i prove my honesty and Can I ask for my salary for three days and notice period.Although I have pics also of attendance register,and resignation steps of HR Portal. Please help Regards