So good news and bad news.
In the meantime I had contacted Razer support.
They requested some information (like did I have other problems beforehand, etc.), which I gave them.
So I was already happy they replied and very fast too. I heard from a lot their support was terrible, as in unresponsive. Of course the problem hasn't been solved yet, but that's a good sign for me.
Anyways, they -after taking a look at my information- decided that there was no hope for my mouse.
However, they did say if I can provide a proof of purchase (which I should have somewhere still, safely stored) and my address, they'll ship a new one.
They don't say free of charge, so I'll have to verify that, but that is amazing if I could just get a new working mouse immediately.
Will keep this updated.