FNB can't do it, again!

I have a debit card, linked to my business account, which has been de-activated due to 3 incorrect attempts at entering the PIN. I called FNB and they told me I had to re-activate it via the app, but it could not be validated on the app. When I called FNB again, I was led down a merry path of different authentications but the system could not 'authenticate' me! It seems to be impossible to do this, either via the app or by phone. Come on, FNB - help me out here, please. It can't be that difficult to give satisfactory service to your clients satisfactorily....?