I bought shares in every dip and acquired lot size worth of shares. Despite of that, my CALL Sell order got rejected due to insufficient funds. Why do I need additional funds for a covered call?
Answering my own question 
Looks like there are no brokers in India who allow covered call without taking premium. This is sad. I must now either fund the premium with extra cash or get margin by pledging.
I have related question which will in a separate thread.