Please don't get me wrong. With all these conflicts between you and the Shuffle team, if you are expecting to continue with affiliation with them then I guess you are ignoring the reality.
I am sure when you signed up to become an affiliate you agreed with their terms and somewhere in the terms they must provided that the business reserves all rights to terminate a contract whenever they want. Considering such terms, as an affiliate you have zero legal ground to do anything against a brand. This is one of the darkside of affiliate marketing to be honest.
I am not making a conclusion of your case or even not trying to give an opinion yet but a business have these terms to protect their business.
I bet this is more like ditching relationships other than being business pals, shuffle obviously knows where OP came from but decided to ditch their relationship over for some reason including business too (for financial reasons maybe).
They knew each other more like personally (i guess), but since shuffle will obviously be at the top if we will follow any ToS due to location restrictions, they decided to ask KYC after almost 2 years (or maybe 2 yrs already) since they knew OP's location. Regardless if OP can provide it, either its the true ID or forged there's no escape to them, so easy ban.
Now, about the remaining commissions balance, i don't think they will give it to you after noah recommending to settle this to Casinoguro to meddle the case or to any casino mediation.