I'm not sure what your issue is, if i have mis-read I apologize. It sounds like you have not registered the domain "I need to register this domain ASAP" but apparently it is not as straight-forward as just registering the domain. "I'm already sent them every prove and explanation about the situation!"
Did it occur to you that you may be getting mad at dreamhost over something that dreamhost has no control over to begin with? As a TLD registrar they have very specific rules they must follow, and they can't simply over-ride those rules just because someone stands up and says "I have the credibility of a 3 year customer and therefor I speak the truth."