Mystery thread

I was so excited when I arrived home and some thread I ordered had arrived so I can finally finish this piece I have been working for 18 months! Only to find that it is the wrong shade. I ordered the correct thread so can only conclude that it is incorrect on the pattern. It's so disappointing and I don't know what to do now! I have such a small piece left to do I really want to finish it! Getting the correct shade is going to be so so difficult!