Dear compubazaar,
Buyers have to select the shipping option themselves while buying the item. So yes, a buyer from Bangalore can, mistakenly, select local courier option while purchasing an item from a Mumbai based seller.
We would request you and all sellers to clearly mention in the item description / payment details that buyers outside of the city you are in have to pay national courier charges.
Regards,
Rohit
Community Development Team
Thanks and Regards,
Rohit,
Buyer Engagement Team