Two different things can go wrong with a load, they are covered in two different ways, and the windows are not the same length. Read whichever applies to you.
If a delivery is signed for clean, the carrier treats the load as delivered intact and the claim route closes. We cannot reopen it for you.
Worth being plain about what this does not cover. A returns load containing goods that do not work is not a defective load. Untested is the condition basis you bought on, and a proportion of non-working units is what that basis means.
If you want to cancel, tell us before the load goes out and it costs you nothing.