I am “siriously” confused. 
Didn’t Shane answer your main question here:
“… closes of accounts occurred for the current brands just after commission disappeared”
This has a two fold answer:
1. you had some accounts closed for various reasons. Please refer to Cobus’s emails as the player data he gave is correct.
2. after a very long campaign to move players off Home and Showdown we have finally shut off the gaming servers. Those few players who were still active were each called personally and assisted with accounts at RiverBelle if the did not already have one.Important:
i] All players migrated in this manner still track to the affiliate who owns them at customer level.
ii] Any inactive players who reactivate at new brands will also belong to the affiliate because of the customer rule.
I am really not quite sure what it is that got you going, but you really should be emailing Cobus for more information as player details are private and certainly do not belong on a public forum.
Referback has proven to be an honest and forthright program for years. It is one of the pillars of the industry. I hardly think that they would suddenly start cheating us out of small amounts of money.
So my recommendation is that you get back with Cobus, where you can get actual detailed answers unlike here on a public message board, where everything has to stay general.