Terrible service from FNB

Hi. Can you urgently assist. A duplicate transaction went off my business account 2 X R1093 on the 2 September 2020. I queried with my service provider Accelerit and they only have one transaction on their side. In addition I was charged an excess fee on my account when the fault is with FNB. This is really insulting. I tried to get assistance on Secure Chat and was advised the banker cannot assist because it is a business account. Then I got an insulting message that FNB has not received a response from me on Secure Chat. This is truly disappointing service from FNB. Can you urgently rectify.