Early Debit Order Unacceptable

My debit order is scheduled for the 1st of each month.

Mweb debited my account on the 29th of April. Due to this, my debit order bounced and I was charged R115 for the unpaid debit order by FNB. I will also be complaining to FNB as they are aware that this is an early debit and so should not allow it to go through.

I want Mweb to pay for the cost of R115 for the bounced debit order as well as well as change my debit order date to the 5th of each month so that this does not happen again.

Why is it acceptable for large corporations to cash in early on their clients to suit themselves at the inconvenience of their clients. This is extremely irresponsible as it affects my credit score.