Fnb duplicating charges, cyber security not up to standard! Ive been ******- help!!!!

I have a Fusion account with my credit card separately. Although having complained numerous times to fnb that transactions on my cheque account have been duplicated and and double charged or processed has fallen on deaf ears and all i ever hear is card and pin was used. I diligently informed them of this ***** happening on my account every instance it transpired and they offered me NO RELIEF as their client and a range of implausible explanations. An online purchase i made was debited from ny credit card twice they only reversed 1 and the receiving bank advised it was only debited once which was reversed. My statement showed i was debited twice and omly one was reversed. In asof March 2020 ********** activity transpired in my credit card and no one at fnb could care less. Wheres yout firewalls and security you brag about but do not exercise. I might not be a billionaire but i deserve the service i pay handsomely for. Their call centre staff are in apt and need training and if thats not the worst i get passed off to every other department but the 1 that can help and even then i have to hunt for feedback as no feels to inform me that im being blamed for something i didnt do. FNB U WERE HACKED IT STANDS TO REASON THAT BEFORE YOUR VERY HUMILIATING PUBLIC HACK SCANDAL THAT whosoever responsible and others might have tried it before. All im asking is that i be out in the situation i was before you duplicated my purchases on both my separate accounts and decided to blame me, so too the ***** i suffered at the hand of.