Total loss car insurance claim?

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But in plus the insurance company also getting the scrape value of car after total loss.

This logic is not right. It is part of terms of the contract.

I have heard that you would get the IDV in case of theft and total loss. Now it is new info for me. So even in case of theft also we get the less value (after depreciation)?

In case of theft 100% IDV is given. There are some additional conditions in it like – If no duplicate key deposited with insurer than (IDV minus 15%) is given etc.