FedEx Corporate Services — customer service

I dropped a package at my only Fed Ex, inside Walgreens and was told I would not get a receipt. The package weighed approximately 5 pounds and my tracking info is showing it weighs almost FIFTY POUNDS!!! Your customer service was very unhelpful and even hung up on me. I am an Ebay seller and I will get word out to others if you even try and charge me more money than originally quoted!