I was also downgraded to Gold after receiving the letter giving status through 2014. When I called, I was told to email a screen shot of the letter. I did this and I was given back my Platinum status.
As far as putting a PDF version for other people, each letter is personalized with their first name. I think they would catch on pretty quick if the same screen shot and name was used for people.
But if you're lucky enough to have saved the copy, then you shouldn't have a problem getting back your status like I did.