I offered a gig of drawing birds and all the artwork I put up was strictly my own, though naturally I had used references to draw those birds. They were birds drawn with coloured pencils using photos as references. Can anyone give an idea, what might have happened? Why was my gig denied? It was original artwork.
Write Customer Support and give them the proof that artwork is yours.
It happened to me too in the past, but everything was solved with them.
Maybe you have to wait some day… good luck!