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The Human Resources Department has decided to conduct a week-long training session for senior management to capacitate them with communication, diversity management, and team leadership skills. Upon arrival at the reserved venue, the trainers find that the venue does not provide all the amenities that were advertised. Consequently, they have decided to inform the management of the venue of their disappointment and to request some sort of redress for this unfortunate encounter. What official business communication method should the trainers use to communicate their grievances to the management team of the reserved venue?