Hello Satya

You can write an application to the university then they will guide you.

Otherwise call them the helpline number given in their website is :01127006900

Email address- du.ug.help2019@gmail.com

Or if it possible then you can directly visit them and can tell your problem.

Contact Details-

Dean Student's Welfare Office,

Room no.5, 1st floor,

Confrence Centre,Near Gate no.4,

North Campus,University of Delhi-110007

You can refer this link for further details:

https://ug.du.ac.in/index.php/site/helpline

So I hope you find this helpful 

Thank you 

Good luck