I have noticed that this issue has been mentioned elsewhere on this form. I am having major issues and receiving complaints from clients that have internet with telstra who cannot access my website a day after a domain name server update. The website is atsijobs.com.au. It is accessible through mobiles but not when using a desktop. Is there a solution for this and can you speed up your refresh of DNS cache somehow?
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I am still at work, so I could not check on Telstra connection as yet, will do as soon as I reach my home... 24 hours should be pretty long enough for it, but I have seen it taking longer on other networks than Telstra... It could possibly also be DNS caching at your clients. Flushing DNS would be the first thing I would suggest... I have also seen it when people set static DNS servers (thinking how clever they were) and pointed them to servers that were kept for legacy purposes but not maintained anymore...
Also to avoid Google Chrome marking your site Not secure:
I warmly recommend to move the whole site (not only login etc) to https.