Why Is This on My Bill? Documentation-Grounded Rule Learning for Itemized Bill Explanation

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Complex itemized bills from services such as cloud computing, healthcare, or telecommunications can be difficult to understand because the pricing terms that determine what a customer pays are straightforward, but the eligibility rules that determine whether a given line item, a single charge for a product and quantity, qualifies for a given price are scattered across user guides, service terms, and fine print. No single document describes them all, and without them, it is difficult to explain why a specific charge appears on a bill.