FNB service and systems are broken

I received an offer to increase my credit card limit which i selected a lower amount, the application was approved and I received a message that I would need to approve the Debi Cheque mandate. To date, its been 4 days I have not received ANY mandates, FNB keeps telling me to approve something they havent sent me, instead they wanted to cancel the application for me to reapply, i have already reapp**** 3 times and everytime the amount offer is less which means this process is messing with my credit score. Can FNB please get their things together so that I the customer are not penalized because their system doesn't work.