i filed my itr through online for the A.Y 2011-12 with 3000 refund
when i checked my refund status i gave wrong account number then i downloaded one account correction letter format from incometaxindiaefiling.com site and i post this letter along with cheque (cancelled) to CPC Bangalore on 01-12-2012
but up to now i did not get any refund and at least one mail also from income tax department site
27 December 2012
You have followed the wrong procedure.
You were required to send cheque to Mumbai SBI instead of CPC banglore.
Now make call to CPC banglore and tell them that you have sent them original cheque back. also ask them to update your refund failure status and reason code as "NOT RECEIVED".
then go to incometaxindiaefiling.com and request for reissue of refund.