Nauseating Service Delivery

FNB had a complaint management system, whereby customers may lodge their complaints and FNB will find amicable solutions to resolve the complaint, i make reference to complaint no:*** dated 5 March 2021 which i have responded that their response was not so whimsical and the individual dealing with the complaint didnt even take the time to investigate and see the proof in which i attached whereby i had sufficient monies in my account, debit order had gone through....FNB notified a credit balance of approximately R200, 4 hours later a sms received to say Debit order has been unpaid, with a charge of R110. The incontact message received from FNB clearly indicates the times and balances and debit order amounts. How difficult can it be for someone to comprehend simple maths!!!!! I have only 1 debit order on this account and this is a fairly new account....biggest mistake to bank with FNB!!!!! The most appalling fragment of this entire situation is that my numerous emails to care@fnb fall on deaf ears or retards.