m15 R3, breakdown, horrible tech support experience

My new M15 R3 $2.5K laptop was diagnosed with NO POST issue by Dell tech support by simply asking me to check pressing F2/F12 or the Caps Lock no LED lights up. Dell tech support concluded that I need a motherboard replacement on this brand new laptop after less than 90 days of purchase.

At first, they scheduled the technician visit within three days, then after a week due to the part delay, then 2 more weeks due to the part delay "again".  While waiting for part, Dell tech support claims:

They have no alternative solution due to the part delay.
They will not send out tech to diagnose. The issue is 100% a bad motherboard. What if we waited the motherboard it turns out to be other parts need replacement or a simple fix?
They do not have a repair center to expedite the replacement process. The repair center doesn't have a motherboard in stock, what a joke?!
They do not provide a temporary laptop as alternative.
They cannot exchange the defective laptop for replacement due to the product quality issue.
They cannot process a return for refund after all above mention.

After 4 hours of calling, all Dell Tech Support and Customer Service can say is to ask me to WAIT for another two weeks. No other action they will do in between. That means I will not have a laptop to use for one month at least. Dell Tech Support and Customer Service does not seem to care or understand the inconvenience of not having the laptop for work for this long period of time. A $2.5K laptop becomes inoperable or will be opened and reworked just after less than 90 days of purchase. Really disappointed, and feel money wasted.  The Tech Support department does nothing like tech support should have done. They simply checked the status and asked me to wait. They did not try to troubleshoot to narrow down the issue, instead of the expensive and long lead time way of replacing motherboard. I suspect they created background noise after hours of calling, claiming their server broke down just to keep the claims away. It has been two weeks, and they keep using the same technique. It's really sarcastic that Dell Tech Support experience computer issue that they cannot resolve at their own.
       
I needed the laptop for important works and my daily life has been interrupted by this cause. Dell Tech Support and Customer Service do not seem to care about customers. They keep delaying the process with an appear rational reason yet do not try to resolve the problem. What is the best they can do now is to let me return the laptop and get a refund, as I am now suffer by this defective product!