No Delivery / No Communication

I was expecting a parcel on 25/05/2015 and it still has not been delivered. When I called the courier company they told me the delivery address does not exist. Firstly no one from CourierIT called to advise me, secondly this is not the first time they have delivered to my address and they had no problems the last time. Please urgently advise what is wrong with my address, I provided you with the street number and name, building name, floor number and unit number. Tracking number ***.