They covered up my "Return" label, causing double taxation.
I sent an item from the US to Canada with clear "Return" instructions. Instead of following them, the service slapped their own label directly over my original one, changing the status to "Merchandise" without my consent. Because of this negligence, Canadian customs treated the package as a new commercial import, forcing me to pay taxes and fees on a return that had already been processed. Their incompetence cost me money due to a completely avoidable documentation error.