what happens to my seat acceptance fee of 35,000 which i paid during josaa counseling if i do not report the alloted institute and didn't pay the partial amount? and i want to go for csab will i have to pay only 1500

Dear student,

If you got alloted any seat, and you accept it then, you have to pay the seat acceptance fees, and if you want to retain your seat, then you have to pay the additional partial admission fees.
If you don't pay the partial admission fees then your seat will be cancelled, and you will get the refund of your seat acceptance fees.

As per rules of josaa - if a candidates seat is cancelled then the seat acceptance fees will be refunded after deducting the JoSAA processing charges of Rs. 2000.
So, you will get back your Rs. 33000.

Now, as you want to take part in csab then yes, you can take part in it if your josaa seat will get cancelled. Also you can take part in csab by retaining your seat.

For participating in csab special round counseling, you have to pay the participation fees of rs. 16500 (for sc/st/pwd) or Rs. 36500 ( for general /obc ).

And if you got allotted any seat in csab special round counselling and you accept it, then you have to pay the seat acceptance fees.

Also check out the following link to know more about buisness rules of josaa 2020 :-
https://josaa.nic.in/webinfo/File/GetFile?FileId=6&LangId=P

Also check out the following link to know more about csab special round counseling :-
https://engineering.careers360.com/articles/csab-special-round-for-nits-iiits-and-gftis