How do you write a letter to bank manager for sending me my Debit card ATM pin code?

Use pen and paper

Put your name and address first

Put your bank name and address underneath

Date it

Write to Bank Manager

Then a paragraph of an explanation about your Debit Card at Pin. A request.

Then your faithfully

Then go into the bank and hand it in.

Or go and get an envelope form post office with a 1st class stamp and post it.