HDFC Bank — loan support time was unable to solve my problem

I was taken a loan from HDFC bank loan no is 66331192 . ( BT loan). Load was approved of RS-508641. Loan amount deposit on 30/3/19 (RS-78139) I was sent an email request for DD on 28/3/19. ( one is RS-12400 & other is for RS-305000).
But they give me wrong DD. After some days on my complain they give me the current DD.
In this process bank take 1 months 10 days.
Now my question is that why I am paying 1 month 10 days extra interest os RS 429000. As it is totally bank mistake. I provide correct mail request for DD.
Bank do the mistake and I have to pay?
I want guests.