How can I cancel an order from a closed online store?

[Andrew3445]

I ordered from a shop called https://allcams.myshopify.com/ yesterday and now it is taken down. I can't contact Shopify because the order number link no longer works because the shop is down. The contact email for Shopify also doesn't work. 

I want to cancel the orders before they charge my credit cards, but they don't give anyone access to cancel orders. What should I do about this?