Canada -> UK customer refused delivery 3 times.

I had a customer order something from my Canada store, and refuse delivery 3 times in UK.

1. The receiver had no invoice information for this package and has refused the delivery.
2. The receiver had no invoice information for this package and has refused the delivery.
3. The receiver states the product was not ordered and has refused the delivery. / We'll contact the sender or receiver about this delivery.

Import fees are due for the product, what should I do in this scenario? Isn't sending a customer their order confirmation e-mail and totals equivalent to an invoice? Do I need to send some sort of different invoice to this customer?

Thank you