unsatisfactory service

I did a payment on the fnb app on the 29th to absa credit card, when I realised that the money was not in by the 2nd of June I contacted FNB. They gave me the lame story of 3 days which they are aware that its not possible for payment to take 3 days. when I called them on the 4th now they are telling me that it will take 20 days for them to resolve!!!! when did it take 20 days for a payment to reflect on the account. that it is rental and landlord is up in arms doesn't bother fnb