Meta store does not deliver to my shipping address

They did cancel the order after half an hour. They wasted 30 minutes of your time, or you did by giving a PO box. That's pretty fast. It's standard practice for security reasons not to deliver products to PO boxes rather than physical verifiable addresses. I think if you give them your actual address you'll get your delivery. Then you wouldn't have wasted 3-4 hours of your own time.