Tech Mahindra — Did not receive Experience letter, relieving letter and form 16

Address: Pune

Hi,
My name is Laxminarayan Charan. I have worked in Tech Mahindra, from 14th Sep 2018 to 15th March 2021.
I am still waiting for experience letter, form 16 and reliving letter document. I have raised my concern multiple times with tech Mahindra but not getting any response.
I am also not able to login into alumni portal since TechM official email id is registered there.
Please help me to resolve my query.
Emp id : 580606
Mobile no [protected]