For R10 FNB rejects a debit order

What the heck FNB?? 2 months ago your call centre agents messed up my account by instead of cancelling existing debit orders they reversed debit orders paid 30 days previously, now today I see you refused a debit order because I was R10 in minus even though R500 was transferred into my smart account this morning by me. You have absolutely no checks and balances nor common sense when it comes to your call centre agents or your computer system. Every month the FNB image of "how can we help you" becomes more and more one of "how can we inconvenience you". Your service just gets worse and worse and worse