Precision 5680, ongoing issues not fixed

Bought a brand new Precision 5680 seven months ago. Five months ago, I contact tech support for "camera not detected" issue. Dell sends an inhouse person to replace LCD. I still have camera not detected issue while he is at my house. He says its a software issue. There is a conflict in device manager. Tech support through WhatsApp cannot solve the issue. I send it in. Dell sends me my system back without troubleshooting. There is still a conflict in Device Manager. Clearly, no one did any troubleshooting. I spend hours with tech support via WhatsApp. The decision, I need to send my laptop in.

I send my laptop in again. Again they send it back without troubleshooting. The conflict in Device Manager is not resolved. Again, nobody looked at it. Dell basically asked me to ship my laptop so they could turn around ship it back to me.

Today there is "microphone not detected" issue. I spend additional two hours. I have ow spent 40 hours over 5 months with no resolution.

Dell Tech support wants to replace my lcd with a refurbished LCD because my system is 7 months old. Keep in mind, I have not been able to use my system for 5 of those months.

I am boot-strapping start-up founder. I will never treat my customers they way I have been treated thus far.

Is this how Dell's we support the "start-up ecosystem" program works?

I have been patient. 

This is ridiculous. As a consumer, would this experience be considered acceptable?