Minor Ebay Problem

I need some opinions , I sold an item on Ebay and got a shipping quote from Greyhound for $65 and that is what the seller paid but when I went to Greyhound the girl didn't bother to weigh the package and just charged me $30 to ship . The buyer wants to know if I'm going to refund the difference and I guess my question is , if it would have cost me more than $65 to ship would the seller have sent me the difference ? What would you do ?
Author: admin