Like factor30 says, I would be expecting to be dealing with customers in some way. I have had 2 jobs that were described as customer services:
1) I worked for NatWest for 18 years and was a Customer Services Officer. Obviously this job involved dealing with customers face-to-face and via the telephone on a daily basis. Balance enquiries, opening accounts, loan applications and general cash transactions over the counter.
2) I then worked for a company that sold a product to various other companies. No face-to-face contact what so ever but I spoke to them on the phone occasionally. This job title was Customer Services Adviser. Mainly I processed orders, sorted out queries, sent out invoices etc. The only contact I usually had with the customer was if they had a problem and had to ring me.