Can't get a live customer service rep

I placed an order for an all-in-one computer on March 25, 2024, and spent weeks waiting for it to arrive after I was given an order shipped notification. In reality, no computer was ever shipped. The online customer service rep then did a return and ordered me a new computer on April 22nd. Then a series of alerts came through with delay messages. I then requested to cancel the order. The order still hasn't been canceled. I have not been refunded for the computer that was never shipped/nor canceled as requested. All I want is to speak with a live human to get the issue resolved. Any tips on how to get to speak with someone? I've tried to call and request a call back with no luck.