FNB - This is how you can help me!

Why can I not find a contact number on the FNB website while logged in? I had to google asking how to contact FNB to get an arb cellphone number from an unknown source. While logged in, I select 'contact' on the online banking website and am forced to complete a form on which I can only choose to get a reply by sms or email. I complete the form and then get an error '404'. While logged out, the website does give contact numbers depending on what options you select on a drop down list but all the lines are constantly engaged. I received an sms with a threat that if I don't verify my details within 10 days, my account will be frozen. Then a second one saying I need to have my ID and proof of residence ready. The number on the sms does not match the number on the website or the number I found in google. I phoned it and it is an FNB recording. I hold and then am cut off. I phone the google number and hold for hours listening to a recording and then get through to a woman who says she has to transfer me to business and then cuts me off. I phone the number on the FNB site drop down list, and it is constantly engaged. I try Securechat on the App but it is not available under 'messages' as indicated on the website and I do have the latest version of the App downloaded. IT SHOULD NOT BE THIS DIFFICULT TO GET HOLD OF MY BANK who has, by sms, threatened to freeze my account. What am I to do?