FNB - how long is 48 hours?

Good day. On the 3rd of October I have send an email to fnb premier banking to close my account. I have also logged a complain on the online banking system, as well as on secure chat. I was promised feedback within 48 hours. Up to date no feedback was provided and the account is still not closed. I was not contacted at all. My preferred method for contacting is via email since I cannot answer my phone during working hours - but no phone call no email no nothing except an empty promise.