Giving me the run around, Clueless!

I just recently changed banks and now i want to swop my debit order details with Standard Bank. I called the call centre on the 17/06/15 and i was referred to the collections department number ***. i spoke to a lady who was not able to help me telephonically and advised me to go to my nearest Branch with my ID. Yesterday 18/06/15 i went to Standard Bank Centurion with my ID and they could not assist me to change these details. I was told that because the Loan was on my brother's name (even thou im the one who is paying for the interest) he was the one who can change the banking details. Today 19/06/15 my brother went to STD BANK bramfontein with his ID and my account confirmation letter. He was told that he can't change the details only I can do that. Now for heaven's sake Standard Bank!! Which is which?? All i want to do is to make sure you guys get your money every month end as per my agreement. FNB called you and you declined them as well... What am i to do now?? Don't you guys want your money??! My other account is closed now, how will you debit??? I have tried everything