Loan Settlement - Terrible Customer Service.

I had a personal loan with Standard Bank, fortunately I have the cash to settle my loan in full as the interest on this loan was very high. Because I was settling the loan from a FNB account I called in the call center to get some instructions: 1- The call centre agent was unable to give me sufficient bank details to settle the loan and I had to go into the branch. 2- I then visited the Sandton City Standard Bank Branch, after some trial and error at the Branch the loan was paid. 3- On the third day I called back into the call centre to make sure all is on track and to close the loan account. The agent then notified me that the I have to return to the Branch to close the account. I then returned to the branch, after standing in a queue for 30 minutes, I was informed that the account was closed and there was no need for me to come in. 4- After settling my loan account, my account was still debited, Because I have settled the loan in full i expect to be refunded my installment in full. However nobody seems to be able to assist me.