Receipt states 'No refunds or exchanges. Statutory rights unaffected' so fortunately they're no. Have e-mailed my local trading standards office but from what i understand they can only threaten with legal action and continue with it if the issue continues. Come next year there will probably not be a Comet Ltd. in existence and thus no one to prosecute so again, unfortunately, i feel this action will prove fruitless. This has happened through what i can only assume is someone buying a real pair of headphones, returning a fake pair and Comet not doing any quality checks on the returned item and putting them back into circulation. I'm just shocked that because of Comet being in administration this allows them to negate their responsibilities to consumers and go unpunished whilst i'm left with a fake product and out of pocket.
I paid on my debit card so i think my only course of action is through the 'Visa Cashback' system suggested in your link to try and dispute the payment, so cheers for your help.