Can I exchange it?
'Cambio' — 'KAM-byo'. The 'io' at the end is a quick glide, one syllable.
When returning with an item that didn't fit or was a gift. Always bring your receipt. Italian shops have the right to limit exchange windows.
'Fare il cambio' = to do an exchange. 'Posso' (can I) is the polite way to ask. Different from 'rimborso' (refund) — exchange is more commonly offered.
Vorrei fare il reso.
I'd like to make a return.
'Reso' specifically means return for refund
Posso cambiarlo con un'altra taglia?
Can I swap it for another size?
Specifying you want a size exchange
Ha la politica di reso?
What is your returns policy?
Ask about the shop's policy upfront
Italian shops are not legally obliged to accept returns unless the item is faulty. Most reputable shops offer exchanges as a courtesy, but always check the policy before buying, especially during sales.