It is mandatory to issue salary slips as per many laws of India: for example
If your establishment is covered under M W Act then you are required to issue wage slips to employees as per sec. 18(3) of Minimum Wages Act, 1948 & the Rules made thereunder.
Take up the matter with employer.If other employees are also ready to demand issuance of salary slip, join hands in a polite manner and ask for salary slips.
Last resort labour office can be approached.
From India, Pune