they have been reviewed by casino.guru but as far as I know casino.guru do not mediate issues that are related to sports betting so I am not sure that your case will be handled by them if you posted a complaint against BITZ.io on casino.guru.

there is a member who suggested Thepogg. but I am not sure if they are as reliable as askgamblers.com or casino.guru. perhaps you can check it out and see for yourself.
File a complaint with Ask Gamblers or ThePogg. They are two that seem to be fair.
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