ICICI Direct — dp charges deducted by icici without any notice

I have a demat account in icici bank for 3 years now. When i checked my bank transactions and i found that there are 3 debit transaction
1. In[protected] dp chgs till jan-18 — inr 826.00' (Deducted 2 times and refunded 1 time)
2. In[protected] dp chgs till jan-17 — inr 805.00'.

When i created the demat account, i was not told about the dp charges, it was told me by the icici representative that it is free of cost and it will never be charged and also i did not get any message alert in my mobile which is registered with mobile banking with icici. My icici account number is[[protected]]. This is completely unacceptable and please refund my amount.