I wrote to the management of the Rainforest Cafe when the 6$ cruddy waterbottles the kids got melted in (not on) the dishwasher. there was nothing on them saying not to dishwash... And they were pretty cool - but had been filled with slushy, so there was sticky syrup everywhere! So I wrote. The district took a week or so to get in touch with me, by mail, and they asked me to call. They wanted more contact info than I had provided to them, they forwarded it to the store manager who called me. They sent out replacement bottles... It took a while, for the letter to pass along the appropriate chains, but there was a response. Do not assume there will be no response.