more than 10 years with employer, I believe relationship shouldn't be bad. It's definitely your boss is playing the game since you're trying to reach them for few days but no reply. It's either the company having really bad time or they are upset you didn't reporting-in on 18th.

like most of the /ktard suggestion, wait till the MCO then get your answer directly from boss. Go directly to labour department if you're ready and willing to lose your job.