Highly disappointed with FNB Housing Finance/ Homeloan

I’m so disappointed with FNB Housing Finance / Home Loans. I have been paying for my home loan on time and when I needed to change the debit order for this month, no one was able to assist. I have resigned from my job (currently working my notice period until end March ) and will be starting a new one in April. My current employer’s HR department communicated with me that my salary won’t be paid in on the 15th as is usually the case but on the 31st of March alongside any amounts owed to me. This means my home loan debit order can’t go off on the 15th since my salary will only be paid month end. I spoke to 3 consultants and none of them were able to assist so my question to FNB homeloans is , would you rather have a consistent payer default on a payment due to a system that can’t accommodate a date change? I don’t want to skip any payments but this situation is out of my hands. All I wanted to do was to change the date to 31st March to accommodate the situation I now find myself in