I bought it online.
'Acquistato' — ac-quis-TA-to. Four syllables, stress on the third.
State this when returning an online purchase at a physical store. EU law gives you 14 days to return online purchases. Mention the order number if you have it.
'Ho acquistato' is passato prossimo — 'I bought/I have bought'. 'Online' is used in Italian as in English, pronounced 'ON-line'. The legal right to return online purchases within 14 days (diritto di recesso) is stronger than for in-store purchases.
Ho il numero d'ordine.
I have the order number.
Essential for processing an online return.
Ho ricevuto la conferma via email.
I received the confirmation by email.
Substitute for a physical receipt.
Voglio esercitare il diritto di recesso.
I want to exercise my right of withdrawal.
Legal language — very formal but impactful.
Not all Italian online retailers have physical shops that accept returns in person. Check the return policy carefully — some require you to post items back using a prepaid label.