earlier made a payment with wrong minor head, however i was not aware of the mistake and the challan correction period collapsed. so i had to make new payment for outstanding demand notice, therefore paid double tax. i filed rectification under reprocessing, as the tax payment details was also reflected in AIS. 
did i followed correct approach for refund ? 
as its been more than 15 days since reprocessing request and im not even sure if i will receive refund or not.
kindly suggest appropriate action
is my course of action correct and how long reprocessing takes?