No response from iStockphoto yet.

I closed my account in Sept 2011 but to my shock today, found a few hundred of my images still available on thinkstock and photos.com, under the same username I had on iStock but with CLOSED at the end ie 'usernameCLOSED'.
To make matters worse, I have just found a number of images that have been licenced recently (ie well after my account closure) with the 'usernameCLOSED' image credit, without any royalty payments to me.
Does anyone had the same experience?