Trying to close FNB Account nightmare

The lack of customer service from FNB "Premier Banking" is an absolute disgrace. Considering the fees people are charged and the profits banks make off their "customers" ... their staff incompetence (don't actually help anyone), bad website coding (secure chat does not auto update), mobile phone app (instructions that go round and round in circles) is not acceptable. All I'm trying to do is close my Platinum Cheque after more than 10 years. Balance is 0.00.

Following instructions from the FNB Account Closure Guide.

Emailed: *** Answer: Please note that this mailbox is no longer available for servicing queries.

Emailed: *** Answer: Remote Server returned '550 5.0.350 Remote server returned an error -> 550 #5.1.0 Address rejected.'

Am logged with a verified browser (screenshot) sent to "Banker" over Secure Chat who just denies I am using a verified browser and thus cannot help. Drops the chat. End up trying to get help from 4 different "Bankers".

Cannot manually verify any device app or browser using QR Code contrary to what the actual app says.

Solution: Use your mobile app for transactions over R300.00 and in a week it will be verified??? What? I'm trying to close the account?

Absolute disgrace. Cannot wait to be free from FNB.