Package Lost in US Customs

I bought something from Highend Audio PC in Switzerland back in March. It took along time for them to receive it from SOTM because of the COVID situation. I have no problem with that. It was finally shipped to me on 4=28-20. According to the tracking info, https://service.post.ch/ekp-web/ui/list/detail/5jJ4zla5ONlRI9XQTdrr6bPPNDO94nMjIHQFXjP3pxo the package is still in New Jersey. I went to my local post office for help and they told me that the package is in US Customs and out of their jurisdiction. Nothing they can do. I've corresponded with Phil at Highend Audio PC via chat several times. He is less than helpful. He  keeps referring me to Claudia who doesn't respond to my emails. What are my options. Please help.