As you have asked about the call letter for interview of Dena Bank, I am giving you some information about it, check below for the details
I want to tell you that I did not find any information about the call letter of Dena Bank.
However, you can check for it regularly from its website.

To check it, you can follow steps given below
Go to Dena Bank website, the page open look like




Click on Recruitment, the page open look like



Here, you will get the information about the call letter when available.

Here I found following:

Notice for Engagement of FLC Counsellors on contract basis in Lead Districts of Gandhinagar, Patan, Bhuj, Devbhumi Dwarka in Gujarat and Silvassa (UT of DNH)
Post Based Rosters