A chargeback starts with the cardholder's bank, not Worldpay. The bank reverses the charge and sends Worldpay a dispute notice carrying a numeric reason code, something like an unrecognized-transaction or merchandise-not-received code, rather than a plain-language explanation. The code itself is often the only detail a merchant gets at first, which is part of why specific codes show up in search on their own.
From there, Worldpay routes active disputes through a dedicated chargeback team, separate from its general merchant support line, and opens a window to submit evidence if the business wants to contest it: an invoice, a delivery confirmation, proof the cardholder authorized the charge. Miss that window and the reversal stands by default, regardless of how strong the evidence would have been.
Worldpay also charges a dispute processing fee when a chargeback is filed, on top of the reversed transaction amount itself, in most merchant agreements. The exact fee and whether it applies win or lose varies by account, so it's worth confirming the specifics directly with Worldpay rather than assuming a number.