Delivered to wrong person, no response from Customer Service

I ordered a package online which was delivered to the wrong address.

My address on the Spree system, has no house number listed, though I registered with the house number and the address was listed on their site as "verified".

On Tuesday 28 November 2017, after I received the delivery confirmation letter I notified Spree that I had not received the package. To date I have not received any feedback from Spree. I contacted the call centre twice since then but was informed that the Team Leader was addressing the matter via a different system that call centre operators do not have access to.

I was promised return feedback which I never received.