[mothered]

As soon as we were notified that you had not received your goods, we initiated an investigation internally and with our carrier.
On conclusion of our investigation, we have determined that the delivery was completed successfully to the address provided.

Tell them to provide photographic evidence of the package condition at the time It was delivered to your address.

The photos must Include every angle of the package, and be clearly visible.

What we think then, go return in store and have a go somewhere else?

As per above.