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.
Do you ask for permission or forgiveness? Has (your answer) ever backfired on you?
Forgiveness. The phase always goes "It's better to ask forgiveness than for permission" and I followed that montra and gave an example where forgiveness backfired but the situation was resolved in an amicable manner.