First of all, you are lucky that you found any native speaker, and you mentioned you found several, so you are happy! Many people here have never spoken with a native speaker.
Second, on this site, there are a lot of scammers, and probably you are happy again because somebody reported them and their accounts ware closed and they didn't do for you any harm.
So, as you see everything is good, you will have other partners again, it takes time to find a good partner. At the moment you can practice your language with non-native speakers.
first of all I should say that Iranian people can't have any teacher or tutor (because we don't have any access to Foreign banks and we can't have any Foreign bank account so we can not pay any $ to them)
talking to natives doesn't have any benefits for them except friendship.(so maybe they don't want to last in a friendship for a long time or even start it)
and also there is so many people who wants to talk with natives.(so maybe they can't handle such a huge friendship request)
i think it would be better to find non-native ones :)