TDS REFUND after revision of return.

Case :

AY- 20-21
Original return tds refund : 20000
TDS after revised return : 25000

Query :
I have received refund as per original return i.e 20000, at the time revised return is also processed but I have not received any difference amount i.e 5000.

Pls suggest the procedure for claiming remaining difference tds refund.