Nuwave Party Mixer Party Mixer is suppose to be dishwasher safe. My 48 oz pitcher's rim melted in my dishwasher Libertyville IL

I have purchased 3 nuwave ovens over the last 15 years and never had a problem until now.....

For Christmas my husband purchased me theParty mixer, 3 months later the 48 oz picter's top rim melted in my dishwasher.  Everywhere on their website www.nuwavenow.com/product_views.php?product_id=2365 and on my 48 oz pitcher it is etched dishwasher safe.  I called and emailed pictures of the pitcher and their quality control feels they don't believe it is a product defect.  They recommend top rack only in the dishwasher.  I feel that should have been stated on the product.  I have tupperware that says "top rack only".  The representative said they would do a one time waiver of the pitcher, but had to charge me $11.95 for S&H.  I asked if they could send it via post office; as it's cheaper, but she said they only use UPS.  

Another problems is if you go to the above link, scroll down to parts & pieces and order just the pitcher, the website shows a S&H charge of $6,95 for my area.  I broght this to the lady's attention, but she refused to honor that S&H price.