If ya bought the kit from a secondary company Year One, NPD, Hitman etc talk to YOUR SELLER, As Mike said they stand behind the products they produce (Better then any company in the industry) but at the same time it is up to the end retailer to make it right by going to the producer with the issue not the end client.
If you buy a new Ford, you dont call the corperate office of Fold with a squeaking issue you speak to your dealership you bought it from and they handle it.
(((( Public Service Message)))) "The more you know" Chime NBC tones........