Corporation Bank — home loan emi payment is incorrectly reported to cibil as delayed payment

I borrowed a home loan from Corporation Bank (Gachibowli Branch), Hyderabad on 09/09/2016. I have given standard instructions to the bank for ECS deduction of the EMI amount from my salary account (Standard Chartered) on 9th of every month. Since then there has been a regular ECS deduction of the EMI from my account as scheduled on 9th of every month or the next working day. There has never been a single day delay of even single EMI payment.
Recently, when I checked my CIBIL report, it shows that the bank has reported a delay of 22 days in the months of June and October each.
I raised a dispute with CIBIL regarding this and received a mail from CIBIL stating that I need to contact the bank for any rectification in DPDs as they are reported by the bank.
When I approached the Bank's branch manager (Gachibowli) branch, he was helpless either saying that I need to contact the head office as all cibil reportings are handled at the HO.
This erroneous /incorrect reporting of my repayment by the bank has affected my cibil score.
I request the concerned authorities to look into this ASAP.

Regards,
Vamshidhar Rao Hazari