So you are saying they mistakenly rain you around 3 btc and asking it back again? I think it is on you whether you want to give it back again or not. If you apply their terms, youbare suppose to say that they already lose it right? I know you can't withdraw it for sure as I know so instead of giving it back better if they lock on your account and both of you guys wont get nothing
Anyway I saw that they want to give you some bonus, do you even get it when you returning their money? If you get it then everything is already fix, nothing to be discussed again
Actually their rain bot made rain of 3.13 btc each to 10 people in English chat room. That's mean it's around 31.3 btc. The same way it rained 1.51 btc each at all other room. There are 4 other language chat room. In all other rooms always 10 user doesn't get rain. However might be more the 20 other user total get 1.51 btc each as rain at other rooms. That's mean over 31.3 btc+ if more then 20 user.
Actually that rain happened for a bug not for a mistake. And DD take the balance away from all other user who can't wd it. They put the site under maintenance and fixed all that time. However few user was able to wd before the maintenance started. DD announced prize for those users who made wd and wish to give it back.