Final answer:
Inappropriately informal and confrontational language in a letter contesting a parking fine should be replaced with polite, concise, and respectful phrases to maintain a professional tone.
Step-by-step explanation:
To contest a parking fine in a formal letter, certain phrases and language should be avoided to maintain a professional tone. In the provided example, several elements are inappropriate for a formal text. Phrases such as 'I'm not happy at all' and 'as if!' are too informal and convey a tone of disbelief that may not be taken seriously. Additionally, the challenge 'if you can prove it, I'll pay it - and not a penny from me until you do!' comes off as confrontational rather than cooperative.
Instead, a formal letter should be polite, concise, and respectful, using phrases such as 'I would like to dispute', 'I believe there has been a mistake', or 'Please review the evidence at your earliest convenience'. By remaining polite and professional, the writer is more likely to receive a positive response from the council.