FNB how can we not help you

I have been an FNB account holder for a few years and but since the start of lockdown this year FNB has gone become impossible and ridiculous to deal with. FNB has rejected debit orders whereby the shortfall on the account is less than 1 R10.00, yes 10 bucks. They back date the transaction and decline the debit order and then charge the insufficient fee immediately. In the past they use to allow some leeway to get the funds in but now they simply don't care. FNB will argue to ensure sufficient funds but when you dealing with a pancreatic cancer patient every cent is required to try and save the life of a parent. FNB don't care about their clients.