Debit order fee

The DSTV debit order due to debit 25 January 2020, I never received a failed debit notification on this day to show me they weren't funds.

On Sunday 26 January 2020, the money is transferred back into my account and R1008 is debited from my account from DSTV. I received payment notification email of the payment that was successfully made.

On Monday 27 January 2020 I received an sms of a failed debit order, when I login into my fnb app I realise that the R1008 was reversed into my account and I was charged R120 for failed debit order.

Could someone explain to me as I am very confused on why the money was debited and than a day later returned as a failed debit order as there was sufficient funds when it debited, how did I incur the charges. Please could this R120 be reversed as according to me the debit order was successful and have proof thereof.