Warranty DELL

I bought a laptop in October 2021, which presented immediate failures, it turns off. At that time I couldn't deal with it. I was only able to do it in January, I
I contacted support, who checked the equipment remotely and updated some drives, told me to try it and call back anything. the team followed
presenting failures, I contacted me again and he referred me to the technical service, but he did not enable the guarantee because he says that it is a blue screen error and that
That error is not covered by warranty. However, based on the capture code that I managed to get, the technical service tells me that it is a problem with the motherboard.
mother, issue that is covered by the guarantee. I insisted with technical service again but they did not give me any kind of solution. Even if
Hypothetically, I will leave the equipment in the official DELL technical service and they diagnose the motherboard problem, in support they tell me that even so, the
brand is not responsible, because according to DELL it is a blue screen error. But ultimately it is an ethical error.