Fed up

I don’t understand, i was pre approved i filled in all the details and shortly they approved the loan… fnb kicked me out and the loan is now gone and if i reapply on the app it declines me?? This doesn’t make sense how do i get approved and then the app glitches and then i can apply and it doesn’t appear on my timeline anymore also?? If i phone the fnb call centre i get transferred from one side to another