This sounds confusing - a Microsoft message was received on an iPhone saying there has been a data leak at The AnswerBank, but you don't use a Microsoft browser on your phone, you use Safari?
Advice from ichkeria and Buenchico is sound. It may be that your email address and password were compromised on another website and you use the same logins on The AnswerBank. I am aware of no such data breaches.
As suggested, use the site
https://haveibeenpwned.com to see if any of your logins have been compromised - it will tell you which site had a data breach involving your email address, if any. We recommend using different passwords for each website you log into, and if you're worried, change your password to be safe - which I see you've already done. I see there is some issue being reported about changing passwords, which I'll look into in a moment.
Members are correct in saying we don't work weekends, however we do have an on-call IT team who are immediately notified (and awoken from their slumber if necessary) if there are any urgent technical problems on the website.
APG, could you please let me know when you emailed us, as I have not received an email from you?
If anyone receives a message like this in future, please try to capture a screenshot and send it to us so that we can more easily help.