2) How do you know that h4ns did not receive the Betmaster claim? I never promised to solve the Betmaster claim!

[...]
He donated for my assistance and my assistance includes email conversations!

Bullshit. You promised to get money from Bestmaster for h4ns by June 30, otherwise you promised to refund the "donation". You didn't get money from Betmaster and you didn't refund.
Whether you use e-mails or carrier pigeons in your "assistance" is irrelevant. You didn't do what you promised.