Antiquated policies

I was sent the incorrect duty bill on an incoming international Parcel by fedex which resultsd in my overpaying by more than double. FedEx apologized and offered me a refund as this was their mistake. In order to process a refund however they required HARD COPIES of documents stamped by my bank...this was a huge inconvenience as my modern bank uses paperless banking and I don't have hard copies of documents stamped by them on hand. I had to go into a bank to get a stamped document proving that my bank account was mine...which doesn't make sense as fedex just received a payment direct from my account. They could at least accept these docs via email rather than requiring hard copies. I was then informed that processing a refund can take 30 days. You'd think they would prioritize this as this was their mistake. Next time I'll use a shipping company that doesn't have antiquated systems in place. It's 2016...