Topic: Wii Classic Controller Pro gets stuck in one position

So I got a third-party controller off Amazon for 15$. I know I cannot expect it to be like the Nintendo one, but this is unacceptable. The buttons and right analog work fine, better than I expected, but then comes the left analog stick. It gets stuck after I push it in the upper-right position and I have to pull it back manually. Other than that it works fine, but it really kills the fun when I have to play a game which requires a lot of precision. The problem sometimes changes. Sometimes it doesn't get stuck, but feels rather woobly. Sometimes it gets stuck in a different position, like the right or lower-right.

Firstly, yes, I know that third-party controllers suck and don't last long. But note that I got this controller yesterday. I don't want to mess with Amazon anymore since they rejected my refund option plus the first-party controllers cost a fortune (35€ on italian Amazon).
Secondly, I searched through Google. All of the suggestions say that I need to either disassemble the controller or buy a new one. I'm not going to do either of those because, as I said, I got the controller yesterday and I'm not about to break it right away. Also, I'm not about to spend another 15$ on a controller that very likely would come in the same condition.

Any help fixing it without disassembling the controller is welcome.

Thanks in advance.

EDIT: I forgot to mention that it also squeeks. Not loudly, but it's really annoying.