Have you tried calling UPS with an atypical problem? Bank of America? United? It's all the same, and the thing is, you don't find out until you actually have a problem with the service you purchased.
There are some exceptions to this rule, for example many brokerages have real customer support. Amazon stands out too - they're not prepared to handle anything unusual, but their model is to refund you almost no matter what.
But by and large, it's absolutely awful in the US and I'm often positively surprised when I need to interact with customer support in other countries, where you actually can reach a courier about your delivery, etc.