I had a similar problem once on a package of 'Salt & Vinegar' chips from Wise. They had the salt, but not the vinegar. I wrote them a nice letter explaining how sad I was to have received vinegar-less chips & sent the package in. About a week and a half later I received coupons for four free bags of chips & a nice explanation of how chip salting/flavoring tumblers work by return mail. For the cost of a stamp I bet they'd do the same for you. Just a thought.

Best,
-Zeke