A few days ago, I found some cans that were bulging and they hadn't even reached the expiration date. I called the manufacturer and provided them with the information they needed on the cans and they were very nice and offered to replace the bulging cans.If you have a few minutes, it may be worth the time to call.
Although I don't do this, some people contact manufacturers regularly. Some manufacturers will even give you free coupons for feedback on their products, both positive and negative. A website called Couponing to Disney has set up a page about coupons and freebies she has received from contacting companies. She also give you ideas on what to say here.