Many thanks, countessalmirena, for your prompt reply & the info.

Yeah, I am trying my luck to cancel my current annual ebay plus membership within the 14 days grace period and, thus, trying to contact ebay.com.au asap.

I'd also tried using  VPN that connected to a server in Syd to mimic as if I'm in Aust.  But, unfortunately, still getting the same error message.