looks like the "monthly bonus" and the "rake back" was the "payment" and judging from how they are ignoring your complaints it is apparent that they have no plan on paying the rest of the $12k.
Too tired to keep hounding them for proof
there is no point in asking them for proof since in their point of view the case has been "solve".
also, I suggest refraining from bumping their thread too many time in one day. itis against forum rules.