It would be great to get some kind of compensation from them. But it seems to me that everything is exactly for this, they are only happy that I lost everything)
The bottom line is that one cannot expect to win at gambling all the time, so there's no point in crying over spilled milk now. Lesson learned.
If your story is true, you gambled with your 300 DOGE, and from what I understand, you managed to withdraw some funds. So, all in all, you are not at a loss.