Delayed shipment and issues with customer service

I got an email saying my order has been delayed.

1) I spoke with the first rep and he could not give me a direct answer. I requested to speak with a supervisor and he REFUSED to put one on the phone. He then placed me on mute so I would be forced to disconnect the call. I used to work in a call center so I know EXACTLY what he did. It is a sneaky trick. 

2) The second rep told me that my computer is in Chicago and that he would put in a ticket to have my shipment expedited. I got an email saying my ticket was put in and that the Chinese manufacturer can take up to 7 days to respond. Why are they contacting the Chinese manufacture when he said my computer is in Chicago?

3) I was told a supervisor will call within 30 minutes and I never received a call. 

I need this computer for work. Dell is literally costing me money. If this doesn't get resolved I can assure that my company will never to business with Dell again and I am going to go to social media with this.