Razer Naga Mouse Right Click NOT WORKING

Hello, I have a problem with my Razer Naga mouse. The right click doesn't work at all. I got it from Swifty in 2012 from his YouTube videos which I was randomly picked as the winner from the giveaway. The mouse worked for a couple of months and then the right clicked stop to work all of a sudden. The mouse is: Razer Naga MMO Gaming Mouse, I searched it on the website it is not there, probably cause is a little bit older version. Can anyone please help me how to fix it and what to do? It is a 150 euros mouse anyway I don't wanna throw it in the garbage or leave it away since I started to play WoW again recently. Please help!