Section 245 notice

one of my clients received an notice under section 245 after filing current AY return. This was pertaining to an demand that was raised in AY 2008-09, but there nothing happened and subsequent returns and refunds had got processed. I have replied to the notice on 10th August, disagreeing to the demand, but till date dept has not reverted. Refund is also kept on hold. what can be done to get the refund.