It was a gift and it is not suitable.
'Adatto' — a-DAT-to. Double the 't'.
Use when returning a gift you received. This explains why you may not have the original receipt and why the item was never right for you. Saying it was a gift often softens the assistant's attitude.
'Era' is the imperfect tense of 'essere' (was). 'Adatto' means suitable or fitting. Without a receipt, shops are not obliged to accept the return, but explaining it was a gift and offering alternative proof (bank statement, gift receipt) can help.
L'ho ricevuto come regalo.
I received it as a gift.
Emphasises you are the recipient, not the buyer.
Chi me l'ha regalato ha lo scontrino.
The person who gave it to me has the receipt.
Redirects the receipt question.
Avete uno scontrino regalo?
Do you have a gift receipt?
Asking if they issued one at time of purchase.
Many Italian shops keep purchase records in their system linked to the date and amount. If you know the approximate purchase date, staff can sometimes trace the transaction even without a receipt.