Most convincing guess is that someone in franchise office or head office, having access to your trade, individually or in consent with the boss, places a counter trade. Now this cannot be general policy because scam will be exposed very soon, but filters down to those trades only where crooked has strong counter view and specific trader, in their view, is new and not aware of rules. What happens next. If trader looses, crook profits and vice versa. when crook looses it denies trader the delivery stating short delivery and intimate exchange Nil delivery trade.
My experience in this episode was a learning one. I kept insisting settlement as per rule for next six month. Lost temper many times during these conversations. Threatened them to sue with SEBI and exchanges, infact contacted SEBI online. Then they started yielding and returned around Rs 19000 in three installment.
Moral of the story - I haven’t seen any religious person who is not morally corrupt atleast once and I haven’t seen any businessman who has not done any irregularities or not cheated to clients atleast once. No body is perfect by nature, it is the surrounding pressure which can keep him awake.