UPS and FED EX delivery drivers

It is a individual problem. UPS delivers here and I ship a lot thru UPS and USPS I have very little problems. I can tell you what you never want to do. I shipped a set of gears to a member here. I dropped the prelabeled package off a the local UPS store. Less than a hour later I realized I sent the wrong set. I haul *** back to the store, to late the UPS truck picked up all the packages. Like was said I tried to get a hold of a human at customer service and figured out how to do it. Keep telling the automated recording customer representative. It worked. I instructed the person I need to stop this shipment. Which I did. That label cost $21.85. Then the right set of gears cost me $21.85 to send. It took 8 days to get my gears back. And they back charged me another $47.00 for canceling a shipment! I should have let to go to the member then send him a return label in the right gears box I shipped the next day. I complained to customer service but they didn’t give ****.