投诉火车票无效及工作人员不愿帮忙

The letter directly and fully addresses all three bullet points with specific invented detail such as dates, route, and number of tickets, and maintains a consistently formal register suited to a company complaint.

Ideas are logically sequenced with clear paragraphing and cohesive devices like 'In relation to' and 'Given this inconvenience', though some linking is slightly mechanical or formulaic.

Vocabulary is flexible and mostly precise for the communicative task, with phrases like 'dismissive behaviour' and 'unusable tickets', but some wording is somewhat overwrought or conventional.

A wide range of structures is used with generally good control, including relative and conditional clauses, with only minor errors or awkward phrasings that do not impede meaning.

The letter clearly achieves its complaint purpose, covers all three bullet points, and maintains a suitably formal tone, though the description of the ticket problem and staff behaviour relies on generalized statements rather than specific detail.

Ideas are logically sequenced across well-formed paragraphs with effective cohesive devices such as 'Moreover', 'Firstly', and 'Additionally', producing a clear and fluent progression.

The vocabulary is flexible and precise, including items like 'exacerbated', 'discrepancies', and 'viable solutions', with only a mildly formulaic closing affecting an otherwise strong resource.

Sentence structures are varied and controlled, using complex forms such as participial and relative clauses accurately, with errors rare and non-impeding.

The response covers all three bullets directly, with vivid specifics such as the booking reference, route, and staff behaviour, and closes with clear, well-judged requested actions in a sustained formal tone.

Ideas progress logically through paragraphing and linking devices like 'Moreover' and 'However', though transitions are occasionally formulaic and cohesion relies on predictable connectors.

Vocabulary is flexible and precise for a formal complaint, including items like 'dismissive', 'vague and unprofessional', and 'take responsibility', with only mild reliance on set formal expressions.

A wide range of structures is used accurately, including complex clauses and passive forms, with rare minor awkwardness such as 'assist me in resolving' phrasing that never impedes meaning.