Worse service ever - Impossible to get an answer on my delivery

I have been waiting for a delivery from the 4th of May, each time I call the call centre i have to hold on forever and then when the consultant takes my call they put me on hold for another 20 minutes or so only to cut my call eventually. That is almost an hour each time I call. I sent multiple requests on the form function on the website but still no response. Everytime I get through to the consultant I am told the address has changed but I gave my correct address since the start and when I track it on the website it says unsuccessful delivery due to incorrect address.... WHERE IS MY PARCEL AND WHEN WILL I GET IT???? OR HAS SOMEONE PERHAPS ****** IT.... THIS IS UTTERLY RIDICULOUS... WORSE COURIER COMPANY EVER.