In order to achieve the results that he wants, the writer of this letter should use formal and respectful language.
He should describe his problem with the product and telephone support line calmly and in a more objective manner, avoiding using insults and swear words.
He should politely ask for his money to be refunded, and avoid threatening the company.
This way, the person who recieves the letter will be more willing to respond to the demands made.
