Here is a comparison of charges of Brokers offering unlimited trading at fixed charge. Info collected from internet sites.
For 100 Nifty Buy/Sell @6000.
I could not calculate for Wisdom and Action since info not available.
Action financial charges 1 paisa per order but AMC Rs.1200 for unlimited trading per year. They seem to be taking interest free refundable security deposit for Depository. Rs.5000 to 50000.
I do not know about service quality. I avoided Finvasia and Comfort.
Info about missing charges and Service will be useful for all