They are thanking you for them disabling your account?
Another gimmick to get money.
It is because a few have told me they have 20 free accounts and at least a 1000 images in them....I have reduced my images down from 482, to 440....and I cannot work in there.,...it is so slow and when I try and work an image in edit, the pages don't load properly and I have to wait a long time....long story but according to that letter, I'll get the images back when my clock ticks back to zero.....
still, I am going to get another account....like the others have.