Poor show from accounts department.

In May, we were informed that the statement procedure was going to change. My sons have been in ADvTECH schools for a number of years. I rang the school (Abbotts College Northcliff and Pinnacle Linden) to make sure bank details had not changed so payment could be made before the start June. This was done, R8600 paid to Abbotts College. On the June 4th, a card payment was declined due to insufficient funds. When I checked, a direct debit had gone through for R9808.50 for Abbotts College. When I enquired, through the new contact details given on the statement, I was told they had no idea why this had happened, the payment was not reflecting either that I had made. Seems this happened to several parents according the person I spoke to. Other than a vague apology, no other action has been taken yet. No explanation as to why so much had been debited either. Very poor show from a company who demands payment on time!