Money debited from bank account before online order complete

Description

Hi, I added an item to the cart on a website and was immediately asked to pick a payment option. I clicked on the Paypal option to pay. After logging into Paypal and confirming the payment I was not redirected back to the site to provide an address for delivery and did not receive an order confirmation email. The money for the item has however been debited from my bank account. The transaction is not showing up in my PayPal account activity. Any ideas about how to deal with this or what went wrong???