Service failure after promising issue is resolved.

This is the second complaint for the same issue after being promised the issue has been resolved. I switched banks from standard bank to FNB and changed all my debit order. After everything is changed i find standard bank running debit off the old account at the end of February which i complained about and after struggles Im promised the issue is sorted. Today 30 March as im calling to close off the account i find they have again debited this account after promising the issue has been resolved so now again i cannot close the account. What do i have to do to get someone with some brains to cancel the debit orders off this account and add my new FNB account. A certain Clint Petersen who i believe works in the complaint department handled my previous complaint and advised all debit orders were switched. So not only did your call centre fail but your complaints department who i would think is equipped more could not resolve something this simple.