My day typical as it is

So today I was at work and I had an incident. At my job we as cashiers have to ask our customers if they would like to buy this weekly product. Now that is exactly what I did. The product of the week was a two pack LED tea-light candles. When I asked her I had said was" would you like to buy a 2 pack of LED tea-lights for a dollar." She had said yes! She 6then took a look at the package, and then asked me where the other package of the 2 was once the transaction is complete. I proceeded to tell her that by 2 pack I obviously meant that there was 2 in the package, and she then gets all huffy, and starts to run her mouth wanting a refund for $1.06. Although that was upsetting to me, that wasn't what pissed me off. What did it was the fact that this woman had strongly implied that I had misrepresented the product. I had basically told her whatever, and let my manager deal with it