14in short?
i agree, that's way more than just a simple stretch.
since the mfg is being difficult about admitting they screwed up take pictures and show them. Sometimes the engineers have a hard time admitting they messed up unless you just show them, that's the only language they understand, physical facts, they would have a hard time disputing photographic proof.
Show the hoses difference in length and have the same part number.

I have had this happen on more than one occasion as to where i had to stick the parts in their face to get them to believe there was an issue.

in the meantime (as was previously suggested)
you can take the correct length hose to a hydraulic hose shop and have them make up a new twinline hose the correct length. Make sure you take the old hose with you so they can match it up exactly.

I have seen this time and time again and in alot of cases the dealer and mfg both will try to ignore the problem and have you just get hoses made locally. While this does get the lift back up and running it does not fix the problem with the mfg supplying the incorrect hose and leaves YOU feeling like they just don't support you or believe your competent enough to know what you are doing. Really annoying imo. :o/