Getting Refund Cheques Returned back

I have been filing returns online for some years now.  My last three returns have been filed from three different addresses due to excigencies of service.  I have been giving complete bank account details in IT returns still the refunds for AY 2008-09 & 2009-10 were sent as cheques to me.  Which were returned due to address being changed.  I filed my last return from N Delhi on 2nd Jul 2011.  The jurisdiction of my PAN as reflected on IT website is Lucknow.  My queries are:
a.    How do I now get the cheques released.

- write to your concerned ITO, with a copy to CPC

b.    Who should I approach ITO Lucknow or ITO New Delhi.

- replied above

c.    Would the address be automatically updated as per the latest IT Return.

- No, you have to revise your PAN DATA ADDRESS to make it effective

d.    Will the IT Dept fwd the cheques again on the new address or I will have to apply for it.

- No, unless pan data is changed, no communication will be done at new address

e.    Can I ask for credit through ECS now again.

- You can ask but ECS is still not in use by ITO

f.     The SBI refund management has replied that they cannot releass or resend the cheques till ITO tells them.

- in such case you have to visit the ITO personally and collect the same.