Termination from service without prior notice/intimation

Dear Sir, I was working in this organisation from April 2014 to December 2018. Probation period-6 month My Ex-Employer has terminate me without intimation.i am writing below from my mail which I got from employer. Subject: Termination of service With reference to the above the management has hereby decided to terminate your services with Immediate effect (with effect from 07.12.17 ). The reason for the same is your negligence of work and irresponsibility. Despite having given opportunities and leniency by the management there has been no change or improvement in your performance and resulted in poor planning and workmanship at site which may result in financial loss and/or loss of client. On the basis of the above you are hereby terminated and relieved from the service of the Organization with immediate effect. You are requested to hand over all your work related responsibility to Mr. Ashish Jha and Other duties and responsibilities to Mr. Dushyant Kumar with immediate effect. Your final settlement will be cleared by the finance department – Head office By order of the Director Even after termination mail I have competed billing and other site related work for 15 days.they have not paid my 26 days salary.i have contacted too many times for my salary.they are telling you have to complete site/drawing work then we will pay. Thanks REHAN REZA