Go to the Mango store where you bought the items you want to return. You will only need to present the purchase receipt.
Free returns in stores
More about Returns, exchanges and refunds
How can I exchange or return an online purchase?
How can I exchange or return an in-store purchase?
How can I find out the status of my return?
How and when will I receive my refund?
Can I exercise the right of withdrawal?
What are the return conditions?
How can I return items that contain flammable substances (perfume, body mist, etc.)?
How can I return a purchase made via iPad in store?