Is the reason for returning the smartphone under warranty due to the inoperability of the “USB Debugging” function?

Question

Android

Hello, maybe someone knows how it looks from the point of view of the law.
There is an android phone, debugging via usb does not work on it (spontaneously turns off), update, hardreset and so on - does not help.
After 22 days, they returned it to the service center with a comment - the claimed defect was not found, although it remained as it was.
The phone is under warranty.

Answer 1

is with the help of an examination, the examination is worth, judging by the smartphone, the price of a smartphone * 6
directly into the law, as you understand, the word "USB" is not spelled out