Loan debited three times

Unfortunatley I have a Personal Loan with Nedbank, it happened that this month an error occurred and they debited 3 times my instalment. - I understood that a mistake had been made and they promised an urgent refund on my account - it will take 2 days they said! I was still not happy with that because I had other debits that have to go off...yesterday ( 26 November 2015) I called to find out the status of my refund and a guy by the name of Siya said the money is already transferred and will be in my account tomorrow ( 27 Nov 2015) - But it is not in my account.<br> <br> I call again this morning the lady by the name of Tebogo says it will be in on the 30th of November....I could not belive this, I have debit orders bouncing off because I am on a negative. I got different stories every time I called. I am so disappointed, I feel like I am being treated unfairly.