Fed Ex adjustment charge for an "underpaid label"
I am trying to figure out how to dispute a charge that fedex sent me for an underpaid label. I attempted to go to my local fedex to get it resolved they told me to call their main customer service. Once I spoke with someone in customer services they said I needed to contact Ebay and dispute it with them. They also said I needed an invoice number that fedex provides. Does anyone know how or what number to call to get this information.
A little more information as to what happened. I shipped out an item that I under weighed. I stated 8.88lbs on the label but according to fedex it weighed 8.90lb so they charged me $30.23 additional. I needed to drop off another package at fedex so I decided to inquire about said charge. She said there was nothing she could do and that was just the price I needed to pay for the mistake. So I said ok fine my mistake. I asked her to please verify the package I was currently dropping off as it was an odd package that was smaller and larger on different parts of the package and I wanted to avoid another underpaid label (keep in mind she was the manager of this location). She verified both weight and dimensions and told me It was fine, fast foward to today I get a notification that Fedex adjusted my label charge by $61.84.