Letter confusion

Earlier this week, I received what looked like TWO letters from Alphonsine, my sponsored child in Rwanda.  She is sponsored through World Vision, and they are great with the correspondence, so I figured the letters got batched.
But I opened them, and while the same child number was on each letter, the last name was different on one of the letters.  AND, the stickers on the letter from my Alphonsine were stickers I'd never sent her.  To make matters more confusing, stickers that I had sent my Alphonsine were decorating the letter from the other Alphonsine, with the different last name (and different circumstances--the other Alphonsine lives with both parents and attends primary school.  My Alphonsine does not attend primary school yet and lives with her Grandmother).
I sent an email off to World Vision, and there are apparently two girls named Alphonsine in the Maraba community, and both last names start with N.  They are unsure if my letters/gifts have been going to my Alphonsine or the other Alphonsine.
I am extremely frustrated.  I am thinking of poor Alphonsine, possibly getting next to NO mail from her sponsor, when I've been sending mailings more than once a month!
I am most worried about the financial gift I sent to my Alphonsine in early November.  I sincerely hope that if the gift went to the wrong Alphonsine that World Vision would make sure Alphonsine and her Grandmother get a gift, since it was WV's fault.  I have to be patient and wait 2-3 months to hear back from the staff in Rwanda about the 2 Alphonsine mix ups.  Hopefully, this can get straightened out very soon.
From now on, I will be putting Alphonsine's last name on all correspondence and packages.