If you have retracted the application before the starting of the course, then as per the JOSAA counselling the fees will be refunded to you with a deduction not more than Rs. 1k from the institute. But there are no time periods available about the refund.

To know more about JOSAA visit the link below:

https://engineering.careers360.com/articles/josaa

To know more about CSAB visit the link below:

https://engineering.careers360.com/articles/csab

I hope this answer helps. All the very best for your future endeavors!