Thank you Babs.
Being in Australia I'm unaware of the regulations regarding returns and obligations in the UK.
It was a mistake on there part for even though I selected a different item to the one that was shipped.
They have told me the goods are with DHL but DHL want to charge them freight so they are in dispute with the courier for over a month now and are not responding to my request to create the credit. I have a build project I'm trying to complete and want to use the credit towards items I need but cannot proceed due to the fact I'm just in this not ending waiting game.