Occasionally a parcel needs a different shipping line after you have submitted it. Its status in Account → Parcels then changes to “Select New Line” (or a similar status with an arrow). Tap the status, or “Pay shipping”, to see the lines available for that parcel now, with their prices and typical delivery days, and pick one. The old shipping quote no longer applies, so always choose from the new list rather than paying an earlier quote. If none of the lines suits you, contact support from the parcel.
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Still stuck?
Open a support ticket from your account, or ask the assistant at the bottom right — it uses the same articles and can look up your orders when you are signed in.