Did they give a reason? Very strange to hear this. I don't your case, but my understanding is that even folks applying from good countries have a chance at getting help to fight their case. My advice is that see whats making them reject your case. Most pro bono lawyers would take the case, regardless of the merits of the case. If there is something fundamentally flawed with your case, that is no reason for them to reject you. If the flaw they are seeing is too big, consider moving forward with your case, minus the flaw somehow. Good luck!