Zerodha — Position Conversion from MIS to CNC, OTM orders are not allowed

My Account no. LJ48**, I'd bought a put options(35000PE) which is at At the money contract. While I'm trying to change the position from MIS to Normal it doesn't allow. while inquiring the customer care, they told that its because of out of the money and open interest. All these are happening while the Banknifty Spot price is around 35053. Its kind of cheating to block the trader from avoiding the loss. I keep on requesting them via customer care to convert the position, but they didn't allow, while other brokers are allowing the same