Monday 12.2.2018, received at 5.53 p.m., female caller claimed to be from Do Not Call (I could not hear all details). Had I been receiving a lot of unwanted/telemarketing calls. They could stop this happening. (I was suspicious as last week I had a call from a man with foreign voice, claiming to be from the Do Not Call section of Telstra, which I knew he wasn't.) Checked my details -- which were from the telephone book anyway, as she couldn't tell me my villa number. Asked for spelling of first name. Then asked for expiry date of credit card, "for verification". I hung up.
I didn't notice the link before I made an enquiry/complaint to Do Not Call Register on their website, but apparently there is a scam going the rounds - callers asking for $100 to block calls. Could be one of these.