Salary for fy.2020.21

Respected sir...our client is an employee in a company. his salary 50 k per month... in the FY 2020.21 his salary for 6 months amount received in the same financial year and remain six months salary received in the month of May 2021,. this Financial year. but company not given 16 form... but amount credited in his bank ac...how to resolve it sir please