Tata Consultancy Services — Need service certificate

Address:

Hyderabad

Currently, I am applying for a Canadian Permanent Residency(PR) and
need a service certificate mentioning the following details.
1. Name
2. Job title,
3. Salary,
4. Duration that I have worked for
3. Role and responsibilities,
4. Type of employment (full-time or part-time)

Could you please let me know how should I proceed with the process as soon as possible?
Note: I have already got the reliving letter with name, salary and job title.
I need a letter most importantly mentioning my roles and responsibilities.