http://track-chinapost.com/startairmail.php shows RV349760107CN was shipped from Dongguan to Canada on Feb 27.

In the past 7 weeks, China was in Chinese New Year holiday and then suffered coronavirus outbreak. 80% airlines to Canada are cancelled. So parcel might need wait extra 4 to 6 weeks to get shipping space. You need some patient.

Right now you can not do anything but waiting. If your buyer protection is expiring, you need open dispute to claim your money back. After you get the parcel in future, then pay back to your seller.