just found one of my photos in somebody else his portfolio on Istock! and im selling there too for years and years?  how is that possible?  guys please check if this thief is selling your photos too

this is his portfolio link,

https://www.istockphoto.com/nl/portfolio/goldenpic?assettype=image&mediatype=photography&sort=best

i already send a mail to istoch but is there a faster way to deal with this?  thanks