Missing ABSA to FNB Payment

Hi

I made a payment to an FNB account on Sunday 20th of January. I selected the immediate payment option. Till today, the money hasn't reflected on the FNB account but it has left my ABSA account. I have called for help and all I got was that the payment is successful from my side and that I should email missing payments. Its 5000 and I haven't heard back. This is unacceptable because the money was to be used as a matter of urgency and now the both of us don't have these funds available. I am considering changing banks because I need more security from people responsible for my funds. Not happy at all!