Well, I guess they are saying that because it's 'defective', i.e random clicking, then it might be prudent to stop using it. In case you accidentally delete some important file etc.
Using it is obviously problematic. You could try updating the software for the mouse if you haven't already. Make sure Windows is up to do date, along with all your system drivers for your PC. Then plug it in and check again. I suspect it's possibly a software /driver glitch, which could be causing the mouse to act strangely.
The mouse cable could be faulty. The mouse sensors could be faulty. There are a number of reasons why your mouse isn't working. Trying different fixes may help.