University Grants Commission — withdrawal of my admission

Address:

307,agb layout,chikkabanavara,bangalore, 721636

I'm sanket adak. I have enrolled my self in ms ramaiah university of applied science (Bangalore) in b. Tech cse 2019. But due to some physical problems i want to discontinue and want to withdraw my admission. I have paid the full fees of first year but now the university says that now admission cancellation should not be done. And they had take my original documents. Also the university regulation says that any student can do withdraw his admission but now they denied.
Sir i request to you that to give back original documents.