Put the documents side by side
Collect the order confirmation, current broadband label, promotion terms, equipment list, and the first or changed bill. Record the account’s plan name and the date each document was issued so an older offer is not mistaken for the current one. Compare recurring service, equipment, optional products, discounts, and taxes or fees as separate rows. Keep one-time charges separate from the expected recurring total. The purpose is to locate the difference, not to infer that every difference is an error.