Proof of residency

Hello,

I have been having problems regarding funding since the foundation course I did in University of Greenwich.
I have duo citizenship (Italian/Brazilian) but me and my whole family have lived in Brazil since always. I moved to the UK in December 2011 to study English and get the Cambridge ESOL certificates.
I was already 19 when I started studying on my Cambridge ESOL courses (first lasted from January until June 2012 and the last one lasted from October 2012 until December 2012). In November 2012, I decided I wanted to extend my 'gap year' in the UK so I started applying for a national insurance number and eventually open my own bank account here in April 2013.

I started doing my foundation course in January 2015, as I was not eligible to start undergraduate courses because the educational system in Brazil is different and my grades would not be valid here. As SFE said they do not fund foundation courses, I managed to save money and ask for financial aid from pretty much every relative I had so I managed to pay my course and live the poorest life ever.
When I thought of applying to SFE for my first undergraduate year, they required proof of residence. As I was not planning to stay in the UK in the first year I lived here, I did not have any bill or whatsoever on my name. I rented a room from an agency and used my Brazilian international credit card which was on my mother's name.
The only proof of residence that I had was my courses certificates and letters of attendance. However, they said that as I was over 18, it would be acceptable anyway.
They then told me to apply next year (2016) so I would only need to send evidence from September 2013. Once again I BORROWED money from friends, which it will take me aaaages to repay them back, and worked 72 hours per week to try to fund as much as possible.

Now I am here applying again and all advisors told me the same thing on the phone: that I would only need to send evidence from September 2013.
I've received a letter from SFE requiring evidence from September 2012, which does not make any sense. How on earth people on the same situation as me will ever get funding? I am a low income student and my mother only earns 15k pounds a year. My father abandoned me after he divorced from my mother and I have no contact with him.
Now advisors are asking me to send evidence from my Language School as it would be valid. I am really not understading what is valid and what is not.
I do not know what to do as I am already on my second year and already confirmed a place in Spain for Erasmus. I am truly feeling helpless and lost.
I hope someone can help me.

Thank you