BAD Customer Service yet AGAIN from Standard Bank

I have been trying to correspond with Standard Bank via email since end May 2019 in order to close my bank account which I no longer need as I live in the UK. The secure message option is also no longer available on internet banking. I have received NUMEROUS responses from various people telling me what to do and even had one person wanting a copy of my banking card back and front - not even asking for my account number. I have submitted the necessary and my account still has not been closed. I have said in my correspondence that any banking fees charged to me will not be paid due to Standard Bank's lack of response or action. There is no money in my account which is now in a negative balance. I am at my wits end as the account needs closed. I am not planning to return to South Africa to leave or even holiday, so how is the account to be closed. With a previous complaint I did a review via Hello Peter and the banking onbudsman to seek closure. I am giving Standard Bank until the end of this week, i.e. 2 August 2019 to get this issue resolved or I will refer this onto the onbudsman.