This is what I have understood from them:
First year no DP maintenance charge. From second year onwards there is some charge (Rs. 250 I think.). They have taken an advance of Rs. 200 from you which will be adjusted against the second year's DP charges.
So for two years from account opening date they will take only Rs. 50 additional for maintaining the demat account. But the Rs. 200 taken in advance is not refundable even if you close your account before 1 year.
Hope this clarifies
By the way this they would have told you if you had asked them.