I got a conference acceptance and my institute registered that. All the expenses to attend the conference were also approved.
When I checked with the respective embassy for visa processing, they asked for a letter of reason from the host country/conference.
Upon request to the conference representatives they excused. When I told them explicitly, once with a sample from some colleague of what I would need and then with the exact form from the official website of their embassy, then the response was, yes we would try our best to prepare it. However, if we couldn't, you can not blame us because the organizer has not promised any such assistance.
Such statement was a shock for me. To me, it was as if, I invite someone to my home, once he is at the door, I tell him, I did not promise you to open the door.
I am not sure if my assumption is wrong or what? maybe that's almost out of their domain but other conferences do prepare these documents.
So my question is:
Is it really the responsibility of a conference organizer to provide the necessary letters to the participants for their visa processing?
In any case, how to deal with such an issue/response?