If things go wrong with goods you have bought, you have the right to return them and get all your money back (a full refund) but you don't have any real grounds for complaint if you made a mistake when buying the item or simply changed your mind. Many shops will help out of goodwill if you have proof of purchase but they are not required by law to do this.
It’s worth asking the retailer if you can return the item but don’t hold out too much hope. If they decide not to, offering an exchange or credit note (which is much the same thing) may be the best you can expect.
In future, shop where they have a policy of unconditional refunds if goods are returned, such as Argos (where you can return any unwanted items free of charge within 16 days for a refund or replacement, as long as they are unused and in their original packaging and condition). This is in addition to your legal rights if the goods are faulty as a goodwill, customer service gesture.
