Delayed delivery

Over a week ago, I was supposed to have my parcel delivered. They phoned to say that the delivery was unsuccessful due to the incorrect address. I have corrected the address with them with 2 different customer service representatives. I have then received an SMS saying that my parcel is out for delivery with the correct address and still nothing has arrived. This is very disappointing as I had to call several times. An SMS was sent to me with the correct address 3 times yet no one has delivered. This is very unprofessional and unreliable.