Would it be ethical to resubmit a research paper to a different conference, when the original venue gave false informations?
If your paper was submitted to a scam publication venue, because that scam venue had willfully misrepresented itself as a legitimate venue, then it is perfectly reasonable for you to withdraw your paper and resubmit it to a legitimate venue instead.  

Actually doing so, however, may pose some challenges, so I would recommend the following procedure:


Get in touch with X and confirm that you really are being scammed, and that it's not just incompetent conference staff.
Assuming you are being scammed, contact the scammers and withdraw your publication, cc'ing the contact at X who has confirmed the scam.
The scammers will likely fail to respect your request for withdrawal, likely publishing without your consent.  You can't do anything about this, because they are fundamentally dishonest, and you don't have the resources to fight them.  X might choose to do so, however.
Submit your paper to a legitimate venue, and get it properly published.


Now, if the scammers publish your paper without your consent before your paper is reviewed, there is the possibility that somebody might notice it and think that you are self-plagiarizing.  It's not clear to me whether it's better to address this head-on with a note in your cover letter, or whether to wait until it comes up (assuming that the reviewers will discount a fraudulent site).  I suspect that it is unlikely to come up, but you should decide whether you would prefer to speak about it in advance or whether you want to wait and respond if necessary.