How can i start a class action law suit against natural cat food companies for not keeping their canned?

Cat food consistent? I am sick of having to return cat food to the store because I purchased a case that was hard, or too mushy, or my cat wont eat it because its not like the last case they ate...I am sick of wasting my time and the expensive medication that I have to put in their food that eventually gets dumped down the disposal. I have written to these companies, spoken with them on the phone, done everything I can think of, but the madness continues. I am sure that I am not alone on this and it needs to be stopped. As expensive as the healthy food is to buy for our pets, we should insist that the food is consistent each and every time.