Amazon Prime — bill from amazon prime

Address:

63128

I received a bill of $13.54 on my july 14 to august 13, 2018 bank of america master card credit card. The last 4 numbers on the credit card were 9177. The transaction date was 8/9/18. The posting date was 8/10/18.
Amazon prime advertises itself as
Amazon prime isn't available for customers who purchase products for the purpose of resale or use amazon prime to ship products to their customers or potential customers.
We may change these benefits occasionally as provided in the prime terms & conditions.
Some items are not available for two-day shipping due to special shipping characteristics and instead will receive free standard shipping, which delivers in 4-5 business days.
Your prime membership may be subject to sales tax in some states.
Customers who are guests of another membership aren't eligible for the following benefits unless they are eligible through their amazon household: membership sharing, kindle owners' lending library, prime video, prime music, and shopping discounts provided by amazon family such as 20% off diapers and 15% baby registry completion discount. Customers who are guests of another membership aren't eligible for prime photos.
Prime members with certain discounted monthly prime offers can’t share their prime benefits.
To use kindle owners' lending library, the kindle device must be associated with the prime account that's eligible for the benefit.

But i have never ordered anything from amazon prime.

What was this bill for?

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