1 in 4 COD orders in India get returned undelivered. Because the customer had freaking call screening on and never picked up.
If that's you, do the brand, the delivery guy and yourself a favour and stop ordering online. You might look cool in your busy schedule but from our POV you are being lazy. The delivery partner calls, gets blocked by your own phone, and marks you "consignee not available." You don't get to call back. He just moves on and the order boomerangs back at our cost, not yours.
Every one of these failed deliveries burns real petrol, packaging material, and efforts by the delivery person. And this "small habit" is an actual environmental and economic mess, and it's entirely avoidable.
Until then congratulations, you've achieved maximum inconvenience for zero commitment.