Is there really nothing that can be done about Grievous?

Last time, I was playing as Obi-wan, there is a villain General Grievous. He did damage 233 and killed me with his claw rush. How it can be fair sir? Really? Did the developers of star wars battlefront 2 lose their brain? or they just put their brain in their house and go to the work? Please fix it sir. I love playing as obi-wan. I nearly killed the whole villains more than once but the less villain I killed is grievous. He is immortal in this game. I'm demanding that developers must use their brain and fix it or just give my money back I nearly paid 70 dolar . Now this game cost less money. Of course they do this if they are not burglars.