they take our coins for few hours and gambling with it till they make profit and if they win they will refund users if they lose they wil find reason if u lucky they answear u
Although I don't trust you, but it is true that Dinabot is having issues in the recent days. Some other users have also complained about stuck fund on their telegram channel. It is happening for this reason 
Try to contact them on the telegram. They will solve it if you really have an issue there. Dinabot team is pretty much active there.