NSFAS - Regarding funding

I am currently incarcerated and applied to NSFAS for funding to study. At first my application was unsuccessful because of incomplete documents it stated that a Non-SASSA declaration form needed to be filled out. I did that and in the for it needed either a social worker or my ex-principal to sign and it was signed by my ex-principal. So now I received feedback again from NSFAS stating that my form needs to be signed by a social worker. I really do not understand how this is happening and why, because I'm in prison and there is no way of me earning a SASSA grant. I sent NSFAS my incarceration to confirm that I'm still n prison. Please help