Is zerodha's brokerage on intraday nifty options is flat rs 20, whatever be the total transaction amount

Why is the benefit of min( .01% or rs.20) not provided in case of nifty options.My total transaction value was about 40000,but was charged 220rs on account of 11 trades.

Turnover for options is computed as: (Strike+Premium)* Lot size and then 0.01% is applied. If the brokerage > 20 after applying 0.01%, then Rs. 20 is charged, else lower.