Brokerage charges on physical settlement stocks in spread trades on expiry day

Dear All,

Has anyone taken a spread position that was netting off, in the money, and they let it expire on last day of the F&O month. What was the overall brokerage + STT + other fees charged on the transaction. For example, Tata Steel CE sell of 1440 CE, and buy of 1460 CE. Tata Steel is at 1470 on expiry day.

I know Zerodha says that it is 0.1% of the transaction value. But I want an exact figure or percentage including everything else. I am going to be in a flight on 26th afternoon and not in a position to square off manually.

I will most likely not take this risk, but want to understand the worst case scenario. Thanks a lot.

Other costs will remain same, just brokerage for net off will be .1% of total contract value. What is the doubt here?