I'm not surprised in the slightest. From what I can tell, pretty much all schools in Poland are sharks. What is more annoying than anything is how, even in the face of being caught, they will continue to lie instead of being honest about the situation. Most people are only there for a year or two so who cares if Oxford Centre just like every other school fudges the tax!? Lying to your face is a bit harder to take, though.
Poland. Beautiful place but avoid it for teaching.