Fnb Credit Card *****

My dads mobile number was **********ly ported to another network and the ********** used his OTP to do online shopping on his FNB Credit Card and there were over Twenty transactions done in One day from two different cities and FNB did not even pick up that something was fishy and they let all those transactions go through.And now FNB says my dad is responsible for this as he had put in a OTP.

NB:My dad is 75 years old he has been with FNB for over 50 years and not once he has did FNB down.Even our business accounts are with FNB and if this the service they want to give well then we will close all our accounts and take our business elsewhere.