LET ME STAY AT UNI.

PLEASE LET ME STAY AT UNI. IM PLEADING.
First of all Thank you for reading my story.
Here's how it goes.. I dropped out of university as I wasn't enjoying my course and therefore had to pay back some overpayments which I set up a direct debit for £5 a month from my bank account. Apparently, there was a problem with this and APPARENTLY I was notified via letter from student finance in 2014.. This is not true from my end. I never received this letter, ever. I also didn't receive any other notification of this. I then started university again in September 2014 at Sheffield Hallam.
Now in my final term of my first year on my new course which is a BA Hons Childhood Studies they are stopping ALL future payments which means that my only option unless I manage to raise £1900 ASAP, is that I will have to  drop out of university. I don't want to do this, university is my life; it is going to give me my career that I want. As everybody knows, student finance are a government run company and the career I want means I will be working for the government benefiting them. Now how does this work out?! I want to protect the children of our country by working for the Social Services as a Social Worker. How am I going to get there without my education? It really does hurt knowing that my career could end before it even starts, it's my life.
They are also stopping my payment of my loan for this month and this is my third payment of this academic year. I now cannot afford my rent and then will be in debt with my accommodation by £1500. I do not have this kind of money. This is not my worry at the moment, I need to stay at uni. Until I pay the £1900 back, I am never going to be able to stay at university.
Please help me, I AM DESPERATE.