I did a quick check on the forum and they seem to not have an announcement thread here so there is not much we can do on this side, perhaps you should try posting this on casino.guru or askgamblers, they might be able you and mediate the issue you have with betplays.com and hopefully get the issue resolved.
Even if the gambling site have announcement thread on this forum, this type of issue can not be solved on this forum. He needs a mediator like casino.guru or askgamblers that you mentioned because the gambling site will not want to post anything related to the issue on this forum because of the user's privacy. Also, it is worth knowing that in most cases, it is true that the gamblers have two or more accounts. This one can be different but out of 100% of such cases, 99.99 to 100% cases found that the gamblers are truly guilty. I think this will not be different.
I never meant that the issue could be solved here in the forum, what I meant when I said "There is not much we can do" is that we can't contact their representative(since they don't have one) and ask them to address the scam accusation here. anyway, yeah, his best option is to go to the websites I mentioned and let them mediate the issue and hopefully get the issue resolved if it is proven that he didn't break any of the casino's terms and conditions.