You'll need to follow this up with Amazon as your purchase path is via Amazon.
Amazon is a direct vendor of many products but they also act as a platform for 3rd party providers to sell their products. Check to see if your purchase was with Amazon being the direct vendor or as a link to a 3rd party company. Also, make sure that the Amazon URL address that you purchased through is a genuine Amazon address. And was the price you paid reasonably close to the retail price via MAGIX or was it a "too good to be true" bargain price? I'm sure you know what's probably happened if the latter.