As the first point of contact between a company and the client, a customer service representative must have impeccable communication skills and conflict resolution abilities. Expect your interview to consist of a lot of role-play or "describe a time when..." questions that will test your ability to deal with irate clients, work well under pressure, and always keep a calm and professional composure.
The "fake call" setup.
There is no real answer for this. You just gotta roll with the scenario they give you and think fast and sound confident.