You don't have the right to return goods simply because you've changed your mind or your circumstances have changed.
Say you bought a smartphone. What if:
Your partner bought you one as a surprise on the same day. Can you take one of them back?
You really wanted a pink one. Can you swap?
The same phone is $100 cheaper in the shop next door. Can you get a refund?
The answer to all these questions is no. The retailer is under no legal obligation to give you your money back or exchange the product. However, some retailers will do so in the interests of good customer service, so it's worth asking.
Some stores have a no-questions-asked exchange policy for customers who change their mind. This usually means you can swap for another item or a credit note. Occasionally, a store returns policy lets you get a refund but it’s up to the store.
If you’re not sure about a purchase, ask the retailer when you buy if it offers exchange cards.
Exceptions to the rule
If you buy on credit or from a door-to-door seller, you’ve got a cooling-off period when you’re entitled to cancel the deal.