Dear Company, 

I would like to take this opportunity to apologize for my rude behavior towards your customer representative last week when I was attempting to return a product. It was inexcusable for me to address them in the manner that I did, and I regret my actions. I understand that your customer representatives are there to help and that they should be treated with respect and courtesy, and I assure you that this incident will not be repeated in the future.

I hope that you accept my apologies and understand that I truly regret this mistake. Thank you for your time, and I look forward to a long and successful relationship with your company.

Sincerely,
[Customer Name]
Gentile azienda, sono molto dispiaciuto per il mio comportamento scortese nei confronti del rappresentante del cliente la scorsa settimana durante il mio tentativo di restituzione di un prodotto.
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