This is an activity that works well for any intermediates. You can use both the writing activity or just the listening/speaking activity by removing the lines in a word document format.
Have the students work in pairs. They need to listen to a complaint their partner experienced, tell their own to their partner, and then both present to the class. In a class of about 12 students, this will take between 30-45 minutes depending on how talkative your students are.
To include writing, have students free write for 5 minutes about their complaint in the top portion of the activity sheet.