I run a warehouse and ship things all over the country. the problem here as I see it is not so much the error in weight, but they are screwing you royally on the difference in shipping costs. here's what I came up with via Con-Way going from 94545 in California to 10014 in New York using our discounted rates. a person off the street would easily pay $100.00 more 930 lb pallet , class 70 (motors) would be $450.99 700 lb pallet class 70 would be $388.67, a difference of only $62.32. I personally would just ignore them, but should you still feel the need to discuss it ask them where the extra came from.