I think UPS needs to know about these emails. Many companies (UPS included) employ 3rd party companies that offer exactly these type of services. 3rd party companies that are often localized in fringe countries due to the associated low costs of employment. Some of these companies do a terrible job and are the primary responsible for the lack of communication and overall service degradation. I'd like to think these service providers are thoroughly audited by the company who employed them, but my own experience at Microsoft tells me they aren't. Rarely they are and never to the extent they should.
But an email to the main company along a strong letter of protest can do a lot more for a good quality service. Last thing I'd want (like these companies or not) is to see a delivery service failing to provide anything but the most spotless of services. In fact, it doesn't take anyone any amount of effort to remember a day when delivery services were mostly invisible to end users. You'd only have to deal with them to sign for the package. Today it seems their service has degraded to a point customer service extends well into package recipients. Judging from those emails, you'll also have to start learning Indoenglish.