When we check our refund status through the site https://tin.tin.nsdl.com/oltas/refundstatuslogin.html it shows "Your assessing officer has not sent this refund to Refund Banker" for long period. However the contact detail for the relevent assessing officer is not avaiable any where. Even when I have raise a query for the contact details to Income Tax department, they have shown the concern that they are unable to get the information for the assesing officer.

It should be avaible on site and should be responsible for update in time.