Hi Mrinal!

The fees for CSAB round participation is not yet announced for this year but according to previous year for GEN-EWS category the fees is around 36500 Rupees.

If you don't get any seat in that round your money will automatically get refunded to you with a 1500 rupees fee charges which means 35000 rupees will get revert back. The time can not be predicted but it will get revert back in your account within 1.5 to 2.5 months.

After that you can mail them with enrollment id to get  your money back.You don't have to worry as most students will easily get their money but you just have to wait with patience.