Query - Self Assesment tax paid online using netbanking, but not reflecting in OLTAS of income tax office

Hi,

I am Ravi Kukreja from Indore (M.P.). I deposited self assesment tax for FY 2010-11 on 25th July 2011 and fie ITR after that.
However, I got demand notice to pay the tax again as it was not reflecting in OLTAS system of income tax office indore.
Now my query is what can I do to resolve this issue ?
I have already contacted bank from which I deposited tax amount. Bank says that tax has been deposited correctly and should reflect in OLTAS system correctly, but assessing officer says that he cannot see the tax as paid.
I have verified form 26AS online. It is reflecting tax paid correctly under 021 Income Tax > 300 Self Assesment Tax for FY 2010-11.
I have also verified challan for any mistakes, the challan is filled correctly without any error.
Shall I file stay petition as I have already received 143(1) demand. I have already replied with 154 reply against 143(1), but further again I have received letter from AO saying that tax paid is not reflecting in OLTAS.
Now my query is what can I do to resolve this issue ?

What further action can IT dept take if this issue persists and I do not take any action?
How long it would take to resolve this issue and when/how tax paid will reflect in income tax OLTAS system.