It has been made clear Blizzard can delete/lose/whatever any of our stuff, and it’s just too bad for us.
Sorry you’re in this sinking boat with us.
I’ve cancelled my sub, and will never buy into another Blizzard product ever again, regardless of how much I have previously enjoyed them, because obviously there is no integrity to our data/collections any more, and our stuff can just disappear at any time, with no satisfactory resolution.