I proceeded to a process of deoxidation of my term...

I proceeded to a process of deoxidation of my terminal, a Huawei p30 that has an ip53 protection of water resistance, but as a precaution I wanted to perform. During the same, a damage was detected on the screen, I was notified and urged by the company and its own initiative to exchange it to see if it worked normally.
Confirmed the normal operation with the new screen, the amount of 219 euros was required. Before my opposition, since it was not a relevant damage that will affect substantially, the terminal was sent to me. Once received, when I started it, I was able to verify that the power supply has been damaged, making it COMPLETELY INSERVIBLE AND UNUSABLE, impossible to acquire the load.

Damage that was NOT detected when doing the test and that worked with perfect normality when he left for his laboratory, fruit and consequence of his own manipulation.

I have not received any solution to remedy the damage caused and have completely misunderstood.