Deleting the duplicate posts works. If the post has to be kept in two places you could use rel="canonical" tag to let Google know which is the original version.
Best posts made by Nlevi
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RE: Same content on site blog as a separate blog. Will unpublishing on one blog evade duplicate content issues?posted in Content Development
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RE: Scarce niche websites for link buildingposted in Intermediate & Advanced SEO
Hello Eblan!
You probably have also tried to get links from these non-profit organizations with whom they are working with?
You didn't mention social media at all. It's probably lively in Mexico? You could try to create campaigns using different social media platforms around the free giveaways to get some social mentions.