Answer:
augmented
Explanation:
Based on the information provided within the question this seems to be an example of the augmented level of a product. This term refers to the non-physical aspect of a product or purchase, which you may or may not pay more than the actual product is worth for. In this scenario the augmented level was the customer service that the clerk demonstrated by solving her problem and replacing her broken sunglasses for a new pair and absolutely free, which they had no obligation to do so.
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