Hey !

According to the JOSAA guidelines , you can only withdraw your fee  till the sixthround of JOSAA counselling. Once you have participated in SEventh round of JOSAA counselling , you are not going to get any fee refund. So , sorry but now you can not get your fee refund. And if you have not got a seat till the seventh riund of JOSAA counselling , you can register for the special round of CSAB counselling.

To know the full procedure for CSAB special round , follow the given link:

https://engineering.careers360.com/articles/csab-special-round-for-nits-iiits-and-gftis

Hope it helps!