Sponsorship issues

I’m trying to apply to a language school this July and one thing I’m having trouble with is the fact that my sponsors aren’t related to me. I’m listed down as a fictive-kin and my agency refused to help with my application. I’m scared and unsure of what to do. Has anyone else dealt with this? I have documents signed by them stating that they’re willing to cover all tuition fees and living expenses but it still won’t be accepted.

by tarugho