Lack of Service and not delivering online order

I placed an order for 3 XBox One games on Black Friday, which is now a month ago. I received 1 item a week after ordering. When I contacted Dionwired, they told me the items are shipped from different warehouses and will arrive in seperate packages. Another week passed and I then received the 2nd item. After following up again, i am told the same story. I then receive an email confirming my order was completed, to which I immediately responded that I am still waiting on one item. I have now phoned so many times and spoken to most consultants in the call centre, with no resolution. Everyone promise to call me back but nobody ever does. I now have to find another Christmas present for my son as I am one gift short. I am extremely disappointed with the service and overall manner in which my order and queries have been dealt with.