The Worst Delivery Service in the US.
I got two almost similar issues with overnight deliveries. They do not deliver the package on time for the first case and required another delivery address for the second. That was a nightmare to talk to an agent with a blocking robot. When you get an agent, he/she only creates a ticket instead of resolving the problem which was very urgent. UPS doesn't resolve issues on time. BEWARE! I also had many issues with deliveries when I purchase certain items from Amazon.com. They reschedule deliveries on their own without asking me.