FNB won't admit they are in the wrong

I have been informed by my antivirus software provider that FNB is blocking my renewal payment. I have been trying to get this resolved with the bank but they claim the problem is on the software company side. After being cut off twice by Nontobeko of 3D Online Secure, and with no solutions forthcoming that I hadn't already tried, in desperation, I tried a card from another bank, given that my subscription has lapsed thanks to FNBs problems. Lo and behold, that payment went through first time, after FNB evidently blocked the transaction 5 or 6 times on two different devices using two different FNB cards and two different browsers. Two fat ZEROEs to FNB and to Nontobeko for claiming FNB wasn't the problem and for claiming I wasn't responding despite my having screenshots showing I was responding in good time.