Has it been shipped yet? Sounds like you're being charged for an oversized package. It needs to be less than 108 inches in length (probably is) and smaller than 130 inches length + girth.

Have the seller cut down the box.

EDIT: Just saw your recent post. Shipping was the seller's responsibility; you've fulfilled your obligation. I'd explain the oversize charge. Seller should have investigated it.

http://images.fedex.com/us/services/...nformation.pdf