***** transactions

I reported 2 ********** transactions on my account which went through during December 2022 to the ***** depart.. When these transactions went through my cheque account there was no form of verification whatsoever on the banking app all i got was an email saying the funds are reserved for purchases which i didnt verify and when i logged into my bank account these amounts were pending.. After almost an hour just trying to speak to someone was told the amounts were flagged and someone would contact me within 7 days.. Still to this day noone has contacted me all i got was a letter after weeks later saying my case has been declined due to a registered device being used behind a secure login and the banking system was working correctly.. now this to me makes no sense whatsoever why would i have flagged these as ********** in the first place.. Now today again just trying to get answers as to what registered device was used for these transactions i know nothing about and for over 2 hours get transferred from one person to the next and still dont have an answer from them.. I am an IT administrator with 20 years experience in IT infrastructure and they talking about scanning pc's for malware on their letter.. Now if their banking system was working according to their letter would it have let not 1 big transaction but 2 of them one after the other through my bank account without any form of verification on the banking app not even i know how this is possible even if i send my own family member money from anything other than my cellphone i have to verify the payments on the banking app now for buying on takealot and alot of other places you have to verify more than once just to have the payment go through but these amounts can go through without any verification at all.. And this service is for their private clients as well which is the most shocking part of it all.. When these transactions were reported long after they were made the amounts stayed pending for a few days before the money got taken off the account.. So what is the point of the ***** department really