Incomplete delivery online order lack of communication

On the 29th of November I purchased two items on the black Friday special. I got a text message on the 3rd and 9th of December stating I will get a sms confirmation of delivery from the courier. I never got the confirmation sms. Instead I've been chasing up on my order for the past 3wks almost going on a month. I've been sending numerous emails and phone calls no feedback whatsoever. I've paid for these items. I only received one item still awaiting a response from Game on my second item. A big box was delivered only to find one item in the box. When I asked where my second item was I was told it was despatched by two different warehouses. Parcel tracking shows delivered but only one item was delivered. Everytime I ring up or have online chats with these agents I keep being told it's being investigated. How long does an investigation take its been a month and no response about what's happening. I'm furious beyond with the service from Game.. I want my money bac****!