"Most of us don't ever read the small print, so most people would go 'oh fantastic' and enter their personal and banking details, then find out they have been charged money on their cards," he said.
"[This scheme] has had a big marketing campaign. People have reported adverts on various websites and platforms. They also had a big campaign on Facebook a couple of weeks back."
Hails said those who had entered their details on the site were unlikely to get a refund from their bank because they had agreed to the terms and conditions.
Those who had been caught out should contact their banks and get their credit cards cancelled, he said.