I assume that u havn't sent any addition documents recently.. Looks like that you got a generic replying and they didn't bother to read your query carefully.
Try sending another CSI. There is no harm in it.
May be but at the same time I havent received any letter from them since status was turned to DM on 8th may 2012, secondly another applicant Usman799 got the letter & reply against CSI "A letter has been sent on dated 2 May 2012"
Please note that both response of CSI were sent on same day to me & Usman799 (Both got DM on same date i.e. 8th May 2012)
In case my case is refused then I should have atleast got the same response of CSI or letter.