Gaming regulators in the Netherlands have slapped a nearly €374k fine on an illegal betting operation based in Rotterdam.

On Thursday, the Kansspelautoriteit (KSA) regulatory body announced what it called the highest penalty ever imposed “in the so-called country-specific domain.” The two offenders are the owners of a betting shop in Rotterdam that falsely claimed to be licensed to offer state-approved gambling services.

The KSA says it issued warnings to the shop owners on two different occasions last year and local authorities in Rotterdam closed the shop for a month earlier this year. The KSA said the owners’ flagrant disregard for these shots across their bow left it with no choice but to dole out the six-figure penalty.

The operators falsely advertised their shop as a licensed purveyor of the state-owned De Lotto’s Toto sports betting and Runnerz horserace betting products. The KSA says this “mixing of legal and illegal gaming is a serious matter” that gives customers “a false sense of safety and security.”