Nothing "instant" with FNB "Instant Accounting" - and no customer service

I've created an Instant Accounting profile for my business through Online Banking. But I'm unable to actually link my business bank account. I've phoned the call center, who informed me it can't be done manually, I have to e-mail ***, and after not receiving a reply after a couple of hours, I called the call center again. This time the agent promised to call me back after doing some admin on the account. Half an hour later she phoned me back and told me it was fixed. But when I logged in, no bank account and still can't link it. So I called again - and got the extention's voicemail. I left a message and received no callback. So I called again various times and got their voicemail. I contacted the FNB app secure chat. They could not help and said they dialed the line and got through, so just call again. I did. Voicemail. And after 3 days still no replay on e-mail.