What will happen if I couln't square off Index sell position on expiry day?

I have sold a naked nifty index option CE NRML order ITM on the expiry day. I couldn’t square it off at 03:30 PM.

What will happen to my sell position? Would I have to pay extra charges ? What are the criteria with which the buy price for my position is fixed? By when will it be squared of ? ( Next settlement day ? )

Pleas help :pray:t3:

Hi @Ved112, have explained this in detail here: