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Sure.
I see many people or cases that have been solved by them. So the credibility is good, I see some case with a 4 BTC Amount on 29 August can be solved by them against stake on CASINO.
Another good things, they can ask a favor from casino for other solution some times. Good luck.
Although this is considered a good way to find a solution to some outstanding problems, it is not reasonable that in every case of complaint, the complainant will be forced to resort to a third party to intervene with the casino to solve his problem, as it is assumed that there is an entire support team specialized in dealing with user complaints.
If all these documents are provided (bank statement/credit card statement/additional line of credit/a loan/utility bill/various other documents) is not enough. It would be funny if the person in charge of casinoguru would succeed in finding a solution.