Intersesting!
Have they acknowledged that they were in fact shipped from them? Or has somebody stolen your parts en-route and substituted some weight?
If it is there mistake, make them overcompensate you. I was billed for door panels and waited 4 months. When calling a few times it was realized that I had to tell them the exact shape of my Swinger rear panels to complete the order. With this new found info I would have to wait again, I simply called legendary and shortened the wait(their panels anyway) and Bi#ched to YO and they gave all my money back, plus a credit card interest rate on the total amount of my order for the 4 month period. I came out money ahead, I was satisfied.