Service Tag has not been programmed — cannot boot system

Hi. Recently I got my laptop back from repairs. The problem I had earlier—the random turning off—persisted even after my laptop was shipped back, until said problem just stopped happening. So, I presumed the problem fixed and left it alone. 

For the first time in a week, the laptop turned itself off again. This time, it took several tries to boot it up, and the fan processor would spin extremely loudly. When I finally got something to surface, the laptop was booting in manufacturer mode, and attempting to exit it causes the service tag error, in which the Service Tag installer is launched. Somehow, my laptop’s service tag has been erased and it’s now an “unidentified system,” and I can no longer open it normally. 

With the multitude of errors I have gotten with this laptop since the day I got it, and lack of repairs on Dell’s part, I’m ready to accept it as a lost cause and take the route of negotiating with Dell Corporate for a replacement one. Is there anything else I can do?

System: Inspiron 15 7000

Processor: Intel(R) Core i7-8550U CPU @ 1.80GHZ 1.99 GHZ

PSU: Dell CN-0g6j41-cg600 power adapter.