Fromm guarantees their food. Return the unused portion to your retailer. You may want to call first to make sure your dealer honors Fromms guarantee.
Where do you go from here? Another high quality food. Just because Fromm is great for HRH doesnt mean it will work for Butler. They are all different and sometimes it takes trying several switches to find the right one. Fromm has a toll free # on their website if you want to discuss it with them.