Well if the customer service was crap, nobody would use the company again! Customer services are usually the first contact that a customer gets with a Company, if they get some person who couldn't care less, it gives a bad impression of the whole company. Word of mouth is a powerful tool and word would soon get round that the Company in question had staff with an attitude, same as if someone receives exceptional service, they will tell everyone and the company will get more custom.
Obviously you need to word it slightly differently than that :-D