Purchased an item, then the store closed and haven’t received anything

I purchased an item from a store on shopify on the 8th October.

I received an initial tracking order and said it was processing.

Since then I haven’t received any updates, no item, and when I try track the order it sends me to a blank page, when I try to onto the store page on shopify it says “cannot be found” how do I get my money back?