Unfair charges made by FNB

I was charged for 12x unpaid fees with individual costs of R105 all amounting to R1260. Reason for this is because my fnb app was blocked and I could not access it to monitor the monies coming in and out. I therefore transferred all my money into my credit card until fnb could assist with my fnb app. The only solution at this point was to get a new card which would take up to 7 working days making this an even longer time to monitor what is happening in the account. Fnb therefore went ahead and charged these amounts which then caused a great disrupt. They are now refusing to assist with a refund of these amounts which I cannot allow because firstly, there was money in the account for some of the debit orders but because of the quick unpaid fee charges, they couldn’t run smoothly. Then again, my account was blocked and there was no solution to assist but to order a new card and unblock the app via the atm.