Everpet

I have been giving my four cats your food for as long as i can remember. I had recently bought everpet basics with tuna and my cats have been violently throwing up and i think that it has something to do with the cat food because they do not eat anything else, but the dry and wet cat food. So if there is anyway i can be notified if there is something wrong with the food because I really dont want my cats to die because of the companies mistake in making it. Thank You!