I just want my money back please

I was paying Unisa on Monday the 3rd of August through the Unisa website and I experienced an error 4 times. The first error was with my Business cheque card which I thought it was because the card is still new and is not registered for online purchases/payments. I then used my savings account and the same error occurred. 2 hours later the money went of on both account (R2010). I called the Business desk and asked them to reverse the money and I was told to fill in a dispute form which I then filled. Today I received a message that I need to submit proof of payment, how do I submit proof of payment when the funds are still in my account under reserved? Unisa did not receive the money. Today when I called FNB told me to call Unisa's bank and ask them to reverse the funds, I am talking about 4000 here not 100.. How can they reverse money that is still sitting in my account? How am i supposed to survive this month? Can someone reverse the money while its still sitting in my account!!! Or should I ask the Ombudsman to request the reversal on my behalf? as much as I love FNB this is just not acceptable!!!!