Creative Dock interview questions

It’s 3 process, 1st round with recruiter , second round with a business analyst. And the final round is a one day boot camp at their office in Prague . The job clearly says Fluent English. There was no Czech language requirement. But interviewer asked all his questions 30 mins into the one hour interview. Then asked to switch to Czech language. After I have clearly told him from the beginning I speak basic Czech. That’s not professional. If you needed Czech and English , they should have stated it in job description and I won’t waste my time applying!