I only have two data points (well, three now with OP): but I susped this is on purpose.
BR and CN both are painful for me for this reason. Try to use a credit card, they will try to SMS a phone number I haven't used in my bank for 3 or more years.
Now that OP tells us about IN i'm starting to see a pattern: for a fraud and insurance company, or being realistic, the payment processor middle man who offers those services at a loss, making their client lose a few sales while pushing their customers (you) to instant electronic payments (BR:pix, IN:UPI, CN:IBPS etc) is a much better deal (for the middle man)!
BR and CN both are painful for me for this reason. Try to use a credit card, they will try to SMS a phone number I haven't used in my bank for 3 or more years.
Now that OP tells us about IN i'm starting to see a pattern: for a fraud and insurance company, or being realistic, the payment processor middle man who offers those services at a loss, making their client lose a few sales while pushing their customers (you) to instant electronic payments (BR:pix, IN:UPI, CN:IBPS etc) is a much better deal (for the middle man)!