Ambiguous Commuciation / Slow response / Poor Customer Service

My package was sent from South Africa to US for repairs via DHL in September 2019.

The supplier sent the repaired items back via UPS and I still have not received the package following infuriatingly and completely ambiguous correspondence from various UPS staff for months now.

I have been informed that the package was sent back to the US and is accumulating penalties fees for storage every day of the delay.

No one can tell me how to release the package, why it was sent back, why no one contacted me to let me know of a problem or why I as recipient is responsible for penalties.

I reiterate that no-one from UPS called/emailed/sms'd me to notify me of a problem. I only became aware of it when I contacted the sender to ask them if the package was sent yet.

It has been months without success and I am extremely unhappy and irritated.