Mobile DND -Receiving the Promo SMS even after starting DND since 4 months frm Airtel

I am Vamsee subscriber of Airtel pre-paid num: “9908864499”
I have started DND 4 months back for my number
On calling the Airtel CC, got the following info about my airtel account:
DND requested on: 15 APRIL 2010
DND on force from: 30 MAY 2010

Still, I am getting the promo SMS es all time in day and night. sometimes getting messages in midnight and early mornings too
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