I need help in demystifying the BTST procedures followed by the brokers please. I bought 900 shares of ICICI on the 4th on delivery and sold them on the 5th. I got the contract notes for both transactions and happily forgot about it. A few days later I got a call from my broker that 102 shares were being auctioned out. I couldn't make head or tail of what he was saying and told him that I had already sold the shares on BTST. To my shock I found my ledger balance short by nearly 88000! The customer service said something like there could have been a default by the seller or the exchange. I have lodged a complaint with the broker but am too anxious to wait. Can somebody tell me what is happening and if the amount will be recredited to my account? Isn't it the defaulting seller or the exchange who should be penalised? I would be grateful for any help. Thanks.