Employer withholding pay?

Started work at start of Jan. Tursa went behind my back and offered them a wage subsidy despite already being employed by the company with relevant experience. Anyway, I worked last Monday for 7 hours and 20 minutes. I injured myself and have been off ever since pending ultrasound and follow-up with GP.

I asked today where's the pay for last Monday? And the employer said he's confused on what to do because Tursa needs me to meet the 15 hour minimum requirement and that he was going to add last week's hours onto another week when I return to work.

Which is why I hate that Tursa involved themselves so much, especially when I found the job myself.

I said I have a medical certificate for the rest of last week, so you'll still need to pay me for last Monday. Still haven't been paid, it's over $200 I'm waiting for.

He can't just withhold the pay, right? He didn't even talk to me about being "confused" 🤦🏻‍♀️