I really DO feel for you, all buyers have been there, and still go through this crap everyday !!!
And NO I do not think you are being unreasonable, you paid good money upfront for a product off the internet, you are at the mercy of the seller and postal services until it arrives in your hands. LOTS of hands and computers and security to get through before it gets to your front door !
I understand, I have literally wasted hundreds and hundreds, making errors on here or sellers making errors, or bad products, or bad postal service etc etc etc ... I could go on an on for days.
BUT at the end of the day, Jam ... you do exactly as you feel to do, and if that means you felt like you should bring this to the publics attention, then that is what you have the right to do.