[header] How to legally dispute internet transactions [title] Gather information about the transaction. [step] Before you do anything, get all the documentation you have regarding the transaction-including receipts, confirmation emails, and shipping notifications-and make copies to share with the merchant. [substeps] You want to be able to explain to the merchant exactly what the problem is and how you'd like it resolved. 
If you want a refund because the product you received was faulty or defective in some way, or arrived broken, you might want to take pictures of it. This could be helpful to your case assuming the damage is something visible.