Dell India — company not responding for complaints in warranty period

Dear sir/ madam,

I bought a dell workstation t7810 with service tag 2bnggp2 and express service tag [protected] and it is currently in the warranty period. The workstation has stopped functioning properly 3 times since we have bought it. Whenever it has suddenly stopped working, the following message comes on screen -
No bootable devices found.
Press f1 key to retry boot.
Press f2 key to reboot into setup.
Press f5 key to run onboard diagnostics.

Every time with some technical assistance it starts working including the case when whole of my data got erased. And the reason that i get from the technical person for this problem is because of not installing some driver update which i don't understand. Because some normal pc if remains out of internet connection still works fine. Also, when we bought this workstation, we bought another same workstation along with it. And on that workstation, there is no need of installing driver update manually and that workstation is working perfectly fine.
So what i understand on this basis that there is some problem with this particular workstation only and probably this is some defective piece. As, within one year o[censored]sing this system, it has not been able to function smoothly and 3 times it has caused the same problem.
And from the attached file also, it is clear that there is no clear reason explained by the dell tech support team for this problem. So this workstation is for sure a defective piece only.
Also, i don't see a solution that this problem won't happen in future. So, i requested dell tech support and [protected]@dell.com to replace the workstation as soon as possible. But as it is shown in the attachment that i am not getting any reply from dell tech support or [protected]@dell.com.
Therefore, i look forward to your help to look into this matter.

Thanking you in advance.