>>> You should approach a competent and experienced labor consultant/service lawyer AS AP with copies of all documents on record and give inputs in person.
It is obvious that company, its HR personnel are not going to bend.
>>> Did you receive any circular/letter addressed to you and also pay slip/wage slip/salary slip showing low pay?
How was salary slip supplied to you from some payroll portal/HR portal?
Did you download it yourself?
If yes did you object to reduction of Basic pay?
Was the employer providing PF, ESIC previously before reduction in salary?
Did it provide PF, ESIC also after reduction in salary?
Are you member of any employee’s union, trade union?
What is this company/establishment registered as: Commercial, Industrial, Small Enterprise?
It should have displayed its registration Certificate at a conspicuous place e.g near entrance/on notice board!
How many employees are employed in it?
What was your designation in offer letter, appointment letter and nature of duties?
This info shall help hence post it.
Ideally the employer should address any amendment/change in writing by letter/written communication addressed to each employee and obtain acceptance to obtain legal force.
If employer has not communicated and you have not accepted then it is unfair and you must object in writing to appointing authority, MD, under proper acknowledgment.
You may also mention that Notice of Determination of Gratuity was not supplied to you despite representations in office on dated……………………..to Mr./Ms………….. designation/dept…………….name of company…………address…………………..
You may also mention that FormI ( fill details @ past salary) is attached and instrument of payment of gratuity payable at…………………(at par or by bank DD) be supplied to you by redg. post only and postage prepaid, self addressed envelope as purchased from PO is attached herewith for sending the payment by redg. post to you.
You may obtain POD and certified copy of run sheet of postman both from PO.