Thanks for the fast reply.
I was about to edit my post to say that after the first call to my work when my colleague said I didn't work there, and the Aussie contact, I got an email to which I replied saying to please not contact my contacts or I would report them for harassment, and that I had no means of paying any debt. So I guess they can figure out that the FB person is the right one.
They then sent a reply saying that it had come to their attention that I was now residing in the UK, that I had sold my Aus house and the sale price (easy to get off the internet anyway), and that they knew I was working at XYZ place, with the 'pay now' request or they reserve the right to refer it to a local UK agent (StevensDrake).
They've requested a mobile number which I am NOT giving!
I haven't replied to the second email. I guess I've already revealed myself...should I now ignore or respond with all the privacy etc info that I've gathered from all the other posts about them?
TIA
PS they have also emailed all the CC statements plus the notice of assignment from National Australia Bank (NAB) dated June 2017, and the section 88 default notice dated 07/02/18 with e 40 day notice period, which is the date I received the second email..