Need Help Obtaining Statement of Need from Bolivia

Hello,

I am originally from Bolivia but I graduated from a med school in Poland. I matched into residency this year and my program is offering me the J1 visa. I have been trying to get the Statement of Need from the Bolivian Ministry of Health but they wont issue it because I haven't they say I am not considered a doctor in Bolivia since I didnt graduate from there. They say that I have to go through the whole process to validate my diploma in Bolivia before they can write such letter. My residency is soon to start and I feel stuck. Can anyone help me with some way to obtain the SoN?