Poor response on a dispute

In December 2018 I lodged a charge-back case with FNB and Investec for a situation where I fell victim to a ********** company. Within 28 days, Investec refunded my full payment. of $10 000. However, with FNB I have made numerous phone calls, sent all required documents and sent dozens of emails to a large number of people. I even lodged a complaint with their customer care department. I don't believe that FNB did any investigation into the matter and have not had a response from them over the last few months. I have lost $23 000 and FNB could not care less.

My understanding is that it is within my rights to request a charge-back. If Investec could respond within 28 days, it is simply unacceptable that I cannot get the same response from FNB. Payments were made from both banks to the same company, for the same reason. It is clear that FNB does not act in the best interest of its clients, even though I have been banking with them for over 25 years.