It demand

Good morning- I am hoping this forum can help me out here.

I filed my income tax return for the AY 2009-2010, where my only income was interest from my NRO a/c. The TDS was deducted from my account, but I realised later that my PAN was not quoted. Since I had filed my return and had a refund due on it, I had been looking to get a refund.

I recently noticed on the income tax website that there was a demand in oct 2010 for the same AY, and I am assuming that this was because of the TDS not quoting my PAN.

The problem I have is, my file was transferred to New Delhi, while I had originally filed it when my tax office was in Chennai. This is causing me problem with getting anyone I know to file a response. Would it make sense for me to send the Assessing Officer my response by registered post? Since I am reaching the 4 year time limit to respond, it is sort of urgent. Appreciate any help on this matter.

thanks and regards