30 years ago Bausch & Lomb offered a $3 mail in rebate on contact lens solution. I was going to buy the solution regardless, but I'll take an extra $3.

The rebate rquired the receipt and UPC cut out from the box to be mailed in. The box contained 2 bar codes on the outside and one on an inside flap - none of which were labeled "UPC Code". So I cut them all out and put in the envelope because I had companies deny rebates in the past for not providing all requested proof of purchase.

3 weeks later I received a letter from Bausch & Lomb saying my rebate request was denied due to incomplete proof of purchase.

I've never bought another B&L product in the past 30 years. And the irony is that, had they never offered the rebate, I still would have bought their product and continued to buy more. Their unwillingness to uphold their end of their own promotional offer is what pissed me off.