which date 20000 get refunded?

If you are talking about some College fee refund then it may take time. Particular date can't be said for refunding your fees. But if the college staff did said that they will refund your fees, they will surely refund your fees. If it's been too long that you didn't get refund, contact the college and let them know about the refund. They will let you know if the process takes time or it's been processing.