I bought nifty future last day and did not sell same day and carry it next day but I had no 25% margin.?

I had no 25% margin of nifty future in my account and India infoline account ledger showing -27000 in my ledger. Today I sold nifty future with margin 19 Rs. (4925-4944) profit of 950 Rs. but in my account ledger they credited only 134 Rs. only. Please tell me what did they charged.