Refund of Excess TDS deducted

Sir I have a refund of ₹17930 of fy 2009-10 which I have not received yet because when the original refund comes i have given a wrong A/c no. to ITD. I have last file my itr physically in Ay 2010-11 can I now get my refund.The refund status sites directs me that- incorrect A/C No - Refund voucher cancelled. The account number advised by the assessee to the ITD is not correct/ got changed. Contact your assessing officer for mofication in account number and fresh release of refund.Now what should I do do take my refund and what documents to be presented in front of assessing officers or what are its other alternative ways.