UNFAIR TREATMENT TOWARDS CUSTOMER

I have a FNB Cheque account for many years already. I also have a Debit Order of R320 going off my account. The scheduled dated for the debit order is the 1st of every month. Because of the past long weekend, I totally forgot about the Debit Order and transferred my available money to another bank account. Now for the joke. At 07:21 this morning, I received a sms from FNB informing me the debit order went off. At 07:27 I paid R350 to the account to cover the debit order. At 10:30 I received another sms from FNB reversing the debit order and they deducted R100 from my account. I phoned FNB customer services enquiring about this. I was informed that the debit order went off 00:00 last night already and because I only made a payment at 07:27, they reversed the debit order. My questions to FNB are : 1. Why did you only send the sms at 07:21 when the transactions was done at 00:00? 2. Why reverse the debit order for a small amount of R320, when the money was in the account at the time you reversed the debit order. 3. You can clearly see I immediately corrected my mistake when I received the sms. 4. Why steel R100 from me without my consent when you reversed the debit order and telling me there is nothing you can do about it. I want the R100 back in my account, for the R100 is about 33.33% of the unpaid Debit order amount. In future, stick to the debit order payment date!!!