Hi Revathi,
I hope you are doing good. Now Coming to your query, If you got a seat in JOSAA but didn't report after 7th round then if you fee any extra fee that will be added to CSAB but the seat acceptance fee 1500/- is not returned to you. So you need to pay the seat acceptance fee again for CSAB if you get a seat in it.
I hope this helps.
All the best.
Thank you.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile