New rolex sub 14060 - stopped working after 4 months!

[Subdoc]

So I'm new to this forum, I bought a brand new rolex 14060 no date submariner from an AD in Toronto in February of this year. A few days ago, it completely stopped while I was wearing it all day. Winding (40+ spins) and tapping did not start the watch up again. I am really frustrated and not sure how to approach this AD. I don't think it's even reasonable for them to fix it as a rolex should not need a fix in 4 months but rather I think I'm entitled to a brand new watch or a refund. Any thoughts on how to approach this?

Thanks!