Hello aspirant!!
The details will be mentioned on the admission letter or on joining letter given by the college. They will be mentioning whether the amount is refundable or not. So please once check that and if you cannot find any information then go through below links for more details.

https://www.careers360.com/colleges/amrita-school-of-engineering-amritapuri

https://www.careers360.com/colleges/amrita-vishwa-vidyapeetham-amritapuri

Good Luck :)