Just noticed this is Argos. Ah, how am I not surprised.
I too have had problems with Argos when trying to return stuff, the most notable one was a faulty PS3 controller which came with a PS3 bundle that I purchased which costed me 350 bucks less then 6 months ago. It went basically like this:
My controller broke so I went to my local store to ask for a replacement, they told me they didn't have any in but that they'd order some from another store that has it but it would take a month.
So, since I have 2 controllers anyway I thought, well, k I'll just wait. It's not their fault they don't have it in stock right?
Month later I go there, a different manager tells me they still don't have it and it will be another 2 weeks, so I'm started to get a bit p off but okay , I wait.
2 weeks later, they still don't have them in stock but they have it in another store 50 miles away from me. So I thought to myself okay, this is taking the ****, so I ask the girl if she can just refund me the controller so I can buy it somewhere else, this comes to an arguement until the manager steps in and starts saying that he doesn't have to give me a controller as the purchase was of a PS3 and not a controller. Which I reply, okay, would you rather give me a whole new PS3 + Controller then?

Anyway, ended up with nothing because they didn't have it anyway.
So I call their customer care team, first person I get tells me that she's going to contact the store, I wait and wait and nothing so I call back, the person called the wrong store! So the wrong store calls me and tells me I can go pick it up and I tell them er, I don't know who you are but I don't live in that town, it's about 50 miles away from here.
So anyway I call argos customer care team again, lady starts argue to me on the phone to which I start getting really ****ed off and since I'm a law student and frankly hate when people are trying to tell me that they don't have to do something when legally they bloody hell do, I go on a mini-lawyer rage in to which I happily quote her the SOGA act aswel as the European directive 99/44/EC

. I demand to speak to a manager and I don't know what the girl said but the manager straight away told me she was very sorry and they were going to send me a check for the value of a controller and I could even keep the old one.
Bottom line: Argos customer service really sucks, don't waste your time with anyone who isn't in a manager position and make sure they know you know your rights as it seems like they like to profit from people's ignorance.