Tired of UPS bad service

Our company which is registered as an essential service provider ordered parts from a supplier overseas before lock down. We have provided UPS South Africa with our essential service provider certificate and tried to call and email, as has the supplier. The call centre number is often not answered or cuts off, the emails get an automated reply and then no follow up. They said that they had the wrong phone number, but did not update the system once the supplier had given the correct number. We only spoke to a person once we had reported them on Facebook. I have just called again to find the consultant with email *** rude and cross with me the customer. When I told her not to be rude and that I needed her to provide a good service she put me on hold as I was speaking and then did not pick up again. This is not just a COVID-19 issue, this is an ongoing problem with UPS deliveries.