Delivery Address not changed

I placed an order on 14/10/2015 (order no ***) and realized I inserted an incorrect delivery address, I then sent an email to customer support to amend the address. I received a response via email (Request #***) stating the address has been amended. I checked on the website and it was changed to the correct address. Today I was tracking my parcel with the courier company and they advised me that they were sending the parcel to the incorrect address. What happened to my request? Why was this info not sent to the courier company? Please urgently send the parcel to the correct address and confirm.