Your negative will be meaningless. Create a flag and with proper information (if any) other users will support this.

I would just mention that any casino of these levels will not have any issue to pay this low amount of money.
I mean 7000$  it should not so terrible, so maybe there is something more on their side for accusing in such way the player.

Not to enter on issue of OP but it something crazy that most of these issues are always with newbies with only 1 posts on forum...