Thanks, did that but on chat they are very incompetent/closed regarding talk about that, my best bet was twitter where they have kinda helpful.
Thing is, yesterday I went to a local oficial samsung service center and they told me the phone was from the US.
Now samsung support US in twitter is saying they don't provide international warranty but I told them I could send the device for warranty (I pay the fees, no drama there) and when repaired they could send it back to a family member living there...
Aaaaaand the problem continues via twitter, I don't know what's so hard about telling me where my phone is from to contact the right customer service :/