Five men were arrested as a result - although local media said there were still two major gangs operating.
Mr Mott said similar scams had been attempted in the UK, often spurred on by groups of friends believing they were sharing a "secret" technique.
"You tend to get people trying to give it a go. As with other forms of fraud, it tends to be a bit cyclical," he told BBC News.
"The bank will investigate it as they would any first-party fraud.
"It's a criminal offence - we identify repeat cards doing this kind of claim."