What is the difference between margin shortfall and debit balance?

[Prayag]

As far as I know, you will be charged both - the penalty for margin shortfall by the exchange as well as interest for the negative balance by the broker. This thread discussed the reasoning behind this -

Double Margin Penalty

Why is Zerodha charging interest @0.05% per day for account shortfall ? Already there is a charge from NSE for margin shortfall. This is double charge for the same shortfall amount. Can Zerodha explain?