The front office people really should have told you that a fee exemption (previously free, now $50) was available to you.
From
http://www.tafensw.edu.au/about/money.htm#exemptions ...
"Concessions
Students who receive a Commonwealth benefit or allowance (see list below) are eligible to pay a Concession fee of $50 per course enrolment per year rather than the full TAFE NSW fee.
Age Pension
Austudy (including Veterans' Children Education Scheme)
Carer Payment
Disability Support Pension (2nd or subsequent enrolment in year)
Exceptional Circumstances Relief Payment
Family Tax Benefit Part A (Maximum Rate)
...etc etc...
Youth Allowance"
If the Youth Allowance was solely dependent on your enrolment then you can apply for a refund if... "You have paid the full TAFE NSW fee but now receive Youth Allowance or Austudy commencing within two weeks of the date of enrolment or the date of first attendance at class (you will be eligible for a concession). "
I mention this so others don't get caught, not to rub salt into your wounds.