Infringement issue or just plain lack of due diligence

A photo I took of Dr. Erlinda Burton on November 2017 at the 39th UGAT held at Capitol University, Cagayan de Oro was published at NCCA’s Agung Magazine (Volume XXI, Number 3, July-September 2018, page 70).

Apparently, the photo did not bear any credit.  Not a name of the photographer can be seen nor even a citation of the blogspot where this was first published.

I first posted this photo as part of "UGAT 39th Annual Conference - In Photos" on this blogspot on 08 November 2017. The post bear the name of the photographer.

The same photo also appeared in Aghamtao (Journal of the Ugnayang Pang-Aghamtao, Inc. / UGAT, Volume 26, 2018, page 187, obituary section).  The photo in that journal bears the photographer's name.

I had already informed NCCA regarding this through a text message but will also be sending a formal email to NCCA Chair Virgilio Almario.