Oh yea, you want to hear bad stories listent o someone in retail. Only a few weeks ago there was this woman in the store who yelled, screamed, and made terroristic threats (a criminal felony, i think) against two of our managers. Why? Because she couldn't accept the fact that her gift receipt was good for store credit only, not cash.
The difficulty of a customer service oriented job depends largely on the policies of the company. Lately my company has been having lots of problems with the return policy. In general we require a receipt for everything. The worst problems come from people wh try to make a warranty exchange without a receipt (it's only a 1 year warranty, plus other loss prevention issues) so they throw hissy fits. If you were concerned about the product breaking, you should have kept the damn receipt.