Damn!!! If you could have only screenshotted the page with the first wallet address they have provided you will have compelling evidence that the wallet address is theirs. Without you having any kind of proof that the first address is theirs you cannot really expect them to take any action as they know no one would believe your story except for your fellow victims. It seems like the low fees are what making their service attractive to anyone and they are just picking some of their customers' large transactions as their next target based on what others have stated. Kudos to you on warning us about their scheme and I am also sorry for your loss.