EU member state. I'm going to take your (and some others) advice and will lawyer up. It's not a matter of lowering my pay now, but I openly fear this is the first step to getting me fired.
It probably is; act accordingly. Continue working if you want, but do no more than your job requires, and only the number of hours per week your country requires without overtime. Find a new job ASAP and contact a lawyer/solicitor.