Wolf of Wilderness Adult Single Protein 6 x 400g - dog wet food

I was very satisfied with Wolf, I always give duck because my dogs can only have one protein source and absolutely can't tolerate chicken. Now, to my utter surprise, I see that the kibble has changed and now contains chicken as well as duck :-( Why is this happening? And also sending the other kibble without any warning. Now I'm stuck with two dogs who have really itchy ears again. And one unopened bag left that I can't use anymore. Poor service.